diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38e1bb96..9f6aa5d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,10 +27,19 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixes
 - AppImage
     - missing **Exec** parameters on generated desktop entries [#152](https://github.com/vinifmor/bauh/issues/152)
-- Core
+    - crashing when trying to retrieve an AppImage history not available on the database anymore (downgrade is affected as well)
+- Flatpak
+    - crashing when trying to downgrade (regression introduced in **0.9.9**)
+- UI
+    - upgrading: only requesting the root password if required [#151](https://github.com/vinifmor/bauh/issues/151)
+    - install/uninstall/downgrade + specific backup settings could lead to crashing
     - bauh release notification not working properly
-- Web:
+- Web
     - installation options window size
+    
+### Changes
+- UI
+    - "backup" dialog is displayed before the "trim" dialog during the upgrade process (if both are enabled)
 
 
 ## [0.9.9] 2020-12-02
diff --git a/bauh/api/abstract/controller.py b/bauh/api/abstract/controller.py
index 097643d8..335814b9 100644
--- a/bauh/api/abstract/controller.py
+++ b/bauh/api/abstract/controller.py
@@ -2,6 +2,7 @@ import json
 import os
 import shutil
 from abc import ABC, abstractmethod
+from enum import Enum
 from pathlib import Path
 from typing import List, Set, Type, Tuple, Optional
 
@@ -53,7 +54,7 @@ class UpgradeRequirement:
 class UpgradeRequirements:
 
     def __init__(self, to_install: Optional[List[UpgradeRequirement]], to_remove: Optional[List[UpgradeRequirement]],
-                 to_upgrade: List[UpgradeRequirement], cannot_upgrade: List[UpgradeRequirement]):
+                 to_upgrade: List[UpgradeRequirement], cannot_upgrade: Optional[List[UpgradeRequirement]]):
         """
         :param to_install: additional packages that must be installed with the upgrade
         :param to_remove: non upgrading packages that should be removed due to conflicts with upgrading packages
@@ -82,6 +83,15 @@ class TransactionResult:
         return TransactionResult(success=False, installed=None, removed=None)
 
 
+class SoftwareAction(Enum):
+    PREPARE = 0
+    SEARCH = 1
+    INSTALL = 2
+    UNINSTALL = 3
+    UPGRADE = 4
+    DOWNGRADE = 5
+
+
 class SoftwareManager(ABC):
 
     """
@@ -95,7 +105,7 @@ class SoftwareManager(ABC):
         self.context = context
 
     @abstractmethod
-    def search(self, words: str, disk_loader: DiskCacheLoader, limit: int, is_url: bool) -> SearchResult:
+    def search(self, words: str, disk_loader: Optional[DiskCacheLoader], limit: int, is_url: bool) -> SearchResult:
         """
         :param words: the words typed by the user
         :param disk_loader: a running disk loader thread that loads package data from the disk asynchronously
@@ -157,7 +167,7 @@ class SoftwareManager(ABC):
         pass
 
     @abstractmethod
-    def uninstall(self, pkg: SoftwarePackage, root_password: str, watcher: ProcessWatcher, disk_loader: DiskCacheLoader) -> TransactionResult:
+    def uninstall(self, pkg: SoftwarePackage, root_password: str, watcher: ProcessWatcher, disk_loader: Optional[DiskCacheLoader]) -> TransactionResult:
         """
         :param pkg:
         :param root_password: the root user password (if required)
@@ -192,7 +202,7 @@ class SoftwareManager(ABC):
         pass
 
     @abstractmethod
-    def install(self, pkg: SoftwarePackage, root_password: str, disk_loader: DiskCacheLoader, watcher: ProcessWatcher) -> TransactionResult:
+    def install(self, pkg: SoftwarePackage, root_password: str, disk_loader: Optional[DiskCacheLoader], watcher: ProcessWatcher) -> TransactionResult:
         """
         :param pkg:
         :param root_password: the root user password (if required)
@@ -264,9 +274,9 @@ class SoftwareManager(ABC):
                 f.write(icon_bytes)
 
     @abstractmethod
-    def requires_root(self, action: str, pkg: Optional[SoftwarePackage]):
+    def requires_root(self, action: SoftwareAction, pkg: Optional[SoftwarePackage]) -> bool:
         """
-        if a given action requires root privileges to be executed. Current actions are: 'install', 'uninstall', 'downgrade', 'search', 'refresh', 'prepare'
+        if a given action requires root privileges to be executed. 'install', 'uninstall', 'downgrade', 'search', 'prepare'
         :param action:
         :param pkg:
         :return:
diff --git a/bauh/gems/appimage/controller.py b/bauh/gems/appimage/controller.py
index 5aea10b7..d55d6571 100644
--- a/bauh/gems/appimage/controller.py
+++ b/bauh/gems/appimage/controller.py
@@ -17,7 +17,7 @@ from pkg_resources import parse_version
 
 from bauh.api.abstract.context import ApplicationContext
 from bauh.api.abstract.controller import SoftwareManager, SearchResult, UpgradeRequirements, UpgradeRequirement, \
-    TransactionResult
+    TransactionResult, SoftwareAction
 from bauh.api.abstract.disk import DiskCacheLoader
 from bauh.api.abstract.handler import ProcessWatcher, TaskManager
 from bauh.api.abstract.model import SoftwarePackage, PackageHistory, PackageUpdate, PackageSuggestion, \
@@ -416,7 +416,8 @@ class AppImageManager(SoftwareManager):
                 app_tuple = cursor.fetchone()
 
                 if not app_tuple:
-                    raise Exception("Could not retrieve {} from the database {}".format(pkg, DB_APPS_PATH))
+                    self.logger.warning("Could not retrieve {} from the database {}".format(pkg, DB_APPS_PATH))
+                    return res
             finally:
                 self._close_connection(DB_APPS_PATH, connection)
 
@@ -582,7 +583,7 @@ class AppImageManager(SoftwareManager):
     def can_work(self) -> bool:
         return self._is_sqlite3_available() and self.file_downloader.can_work()
 
-    def requires_root(self, action: str, pkg: AppImage):
+    def requires_root(self, action: SoftwareAction, pkg: AppImage) -> bool:
         return False
 
     def prepare(self, task_manager: TaskManager, root_password: str, internet_available: bool):
diff --git a/bauh/gems/appimage/resources/locale/en b/bauh/gems/appimage/resources/locale/en
index 5394cf31..d69efe5a 100644
--- a/bauh/gems/appimage/resources/locale/en
+++ b/bauh/gems/appimage/resources/locale/en
@@ -14,7 +14,7 @@ appimage.downgrade.first_version={} is in its first published version
 appimage.downgrade.impossible.body={} has only one published version.
 appimage.downgrade.impossible.title=Impossible to downgrade
 appimage.downgrade.install_version=It was not possible to install the version {} ({})
-appimage.downgrade.unknown_version.body=It was not possible to identify {} current version in its versions history
+appimage.downgrade.unknown_version.body={} current version was not found in its release history
 appimage.error.uninstall_current_version=It was not possible to uninstall the current version of {}
 appimage.history.0_version=version
 appimage.history.1_published_at=date
diff --git a/bauh/gems/arch/controller.py b/bauh/gems/arch/controller.py
index 2a06cd94..e365bb34 100644
--- a/bauh/gems/arch/controller.py
+++ b/bauh/gems/arch/controller.py
@@ -16,7 +16,7 @@ from typing import List, Set, Type, Tuple, Dict, Iterable, Optional
 import requests
 
 from bauh.api.abstract.controller import SearchResult, SoftwareManager, ApplicationContext, UpgradeRequirements, \
-    TransactionResult
+    TransactionResult, SoftwareAction
 from bauh.api.abstract.disk import DiskCacheLoader
 from bauh.api.abstract.handler import ProcessWatcher, TaskManager
 from bauh.api.abstract.model import PackageUpdate, PackageHistory, SoftwarePackage, PackageSuggestion, PackageStatus, \
@@ -2476,8 +2476,8 @@ class ArchManager(SoftwareManager):
     def cache_to_disk(self, pkg: ArchPackage, icon_bytes: bytes, only_icon: bool):
         pass
 
-    def requires_root(self, action: str, pkg: ArchPackage):
-        if action == 'prepare':
+    def requires_root(self, action: SoftwareAction, pkg: ArchPackage) -> bool:
+        if action == SoftwareAction.PREPARE:
             arch_config = read_config()
 
             if arch_config['refresh_mirrors_startup'] and mirrors.should_sync(self.logger):
@@ -2485,7 +2485,7 @@ class ArchManager(SoftwareManager):
 
             return arch_config['sync_databases_startup'] and database.should_sync(arch_config, None, self.logger)
 
-        return action != 'search'
+        return action != SoftwareAction.SEARCH
 
     def _start_category_task(self, task_man: TaskManager):
         task_man.register_task('arch_aur_cats', self.i18n['task.download_categories'].format('Arch'), get_icon_path())
diff --git a/bauh/gems/flatpak/controller.py b/bauh/gems/flatpak/controller.py
index ff9ce5c4..9fb6ef47 100644
--- a/bauh/gems/flatpak/controller.py
+++ b/bauh/gems/flatpak/controller.py
@@ -8,7 +8,7 @@ from threading import Thread
 from typing import List, Set, Type, Tuple, Optional
 
 from bauh.api.abstract.controller import SearchResult, SoftwareManager, ApplicationContext, UpgradeRequirements, \
-    UpgradeRequirement, TransactionResult
+    UpgradeRequirement, TransactionResult, SoftwareAction
 from bauh.api.abstract.disk import DiskCacheLoader
 from bauh.api.abstract.handler import ProcessWatcher, TaskManager
 from bauh.api.abstract.model import PackageHistory, PackageUpdate, SoftwarePackage, PackageSuggestion, \
@@ -112,7 +112,7 @@ class FlatpakManager(SoftwareManager):
     def _add_updates(self, version: str, output: list):
         output.append(flatpak.list_updates_as_str(version))
 
-    def read_installed(self, disk_loader: DiskCacheLoader, limit: int = -1, only_apps: bool = False, pkg_types: Set[Type[SoftwarePackage]] = None, internet_available: bool = None) -> SearchResult:
+    def read_installed(self, disk_loader: Optional[DiskCacheLoader], limit: int = -1, only_apps: bool = False, pkg_types: Set[Type[SoftwarePackage]] = None, internet_available: bool = None) -> SearchResult:
         version = flatpak.get_version()
 
         updates = []
@@ -174,7 +174,7 @@ class FlatpakManager(SoftwareManager):
         watcher.change_progress(10)
         watcher.change_substatus(self.i18n['flatpak.downgrade.commits'])
 
-        history = self.get_history(pkg)
+        history = self.get_history(pkg, full_commit_str=True)
 
         # downgrade is not possible if the app current commit in the first one:
         if history.pkg_status_idx == len(history.history) - 1:
@@ -295,9 +295,9 @@ class FlatpakManager(SoftwareManager):
             else:
                 return {}
 
-    def get_history(self, pkg: FlatpakApplication) -> PackageHistory:
+    def get_history(self, pkg: FlatpakApplication, full_commit_str: bool = False) -> PackageHistory:
         pkg.commit = flatpak.get_commit(pkg.id, pkg.branch, pkg.installation)
-        commits = flatpak.get_app_commits_data(pkg.ref, pkg.origin, pkg.installation)
+        commits = flatpak.get_app_commits_data(pkg.ref, pkg.origin, pkg.installation, full_str=full_commit_str)
 
         status_idx = 0
         commit_found = False
@@ -444,8 +444,8 @@ class FlatpakManager(SoftwareManager):
     def can_work(self) -> bool:
         return flatpak.is_installed()
 
-    def requires_root(self, action: str, pkg: FlatpakApplication):
-        return action == 'downgrade' and pkg.installation == 'system'
+    def requires_root(self, action: SoftwareAction, pkg: FlatpakApplication) -> bool:
+        return action == SoftwareAction.DOWNGRADE and pkg.installation == 'system'
 
     def prepare(self, task_manager: TaskManager, root_password: str, internet_available: bool):
         Thread(target=read_config, args=(True,), daemon=True).start()
diff --git a/bauh/gems/flatpak/flatpak.py b/bauh/gems/flatpak/flatpak.py
index a273b4c1..e39f048a 100755
--- a/bauh/gems/flatpak/flatpak.py
+++ b/bauh/gems/flatpak/flatpak.py
@@ -233,7 +233,7 @@ def downgrade(app_ref: str, commit: str, installation: str, root_password: str)
                          wrong_error_phrases={'Warning'})
 
 
-def get_app_commits(app_ref: str, origin: str, installation: str, handler: ProcessHandler) -> List[str]:
+def get_app_commits(app_ref: str, origin: str, installation: str, handler: ProcessHandler) -> Optional[List[str]]:
     try:
         p = SimpleProcess(['flatpak', 'remote-info', '--log', origin, app_ref, '--{}'.format(installation)])
         success, output = handler.handle_simple(p)
@@ -245,7 +245,7 @@ def get_app_commits(app_ref: str, origin: str, installation: str, handler: Proce
         raise NoInternetException()
 
 
-def get_app_commits_data(app_ref: str, origin: str, installation: str) -> List[dict]:
+def get_app_commits_data(app_ref: str, origin: str, installation: str, full_str: bool = True) -> List[dict]:
     log = run_cmd('{} remote-info --log {} {} --{}'.format('flatpak', origin, app_ref, installation))
 
     if not log:
@@ -262,7 +262,7 @@ def get_app_commits_data(app_ref: str, origin: str, installation: str) -> List[d
         commit[attr] = data[1].strip()
 
         if attr == 'commit':
-            commit[attr] = commit[attr][0:8]
+            commit[attr] = commit[attr] if full_str else commit[attr][0:8]
 
         if attr == 'date':
             commit[attr] = datetime.strptime(commit[attr], '%Y-%m-%d %H:%M:%S +0000')
diff --git a/bauh/gems/snap/controller.py b/bauh/gems/snap/controller.py
index b641d417..36579a54 100644
--- a/bauh/gems/snap/controller.py
+++ b/bauh/gems/snap/controller.py
@@ -5,7 +5,7 @@ from threading import Thread
 from typing import List, Set, Type, Optional, Tuple
 
 from bauh.api.abstract.controller import SoftwareManager, SearchResult, ApplicationContext, UpgradeRequirements, \
-    TransactionResult
+    TransactionResult, SoftwareAction
 from bauh.api.abstract.disk import DiskCacheLoader
 from bauh.api.abstract.handler import ProcessWatcher, TaskManager
 from bauh.api.abstract.model import SoftwarePackage, PackageHistory, PackageUpdate, PackageSuggestion, \
@@ -255,8 +255,8 @@ class SnapManager(SoftwareManager):
     def can_work(self) -> bool:
         return snap.is_installed()
 
-    def requires_root(self, action: str, pkg: SnapApplication):
-        return action not in ('search', 'prepare')
+    def requires_root(self, action: SoftwareAction, pkg: SnapApplication) -> bool:
+        return action not in (SoftwareAction.PREPARE, SoftwareAction.SEARCH)
 
     def refresh(self, pkg: SnapApplication, root_password: str, watcher: ProcessWatcher) -> bool:
         return ProcessHandler(watcher).handle_simple(snap.refresh_and_stream(pkg.name, root_password))[0]
diff --git a/bauh/gems/web/controller.py b/bauh/gems/web/controller.py
index 7372d386..11672c55 100644
--- a/bauh/gems/web/controller.py
+++ b/bauh/gems/web/controller.py
@@ -17,7 +17,8 @@ from colorama import Fore
 from requests import exceptions, Response
 
 from bauh.api.abstract.context import ApplicationContext
-from bauh.api.abstract.controller import SoftwareManager, SearchResult, UpgradeRequirements, TransactionResult
+from bauh.api.abstract.controller import SoftwareManager, SearchResult, UpgradeRequirements, TransactionResult, \
+    SoftwareAction
 from bauh.api.abstract.disk import DiskCacheLoader
 from bauh.api.abstract.handler import ProcessWatcher, TaskManager
 from bauh.api.abstract.model import SoftwarePackage, CustomSoftwareAction, PackageSuggestion, PackageUpdate, \
@@ -801,7 +802,7 @@ class WebApplicationManager(SoftwareManager):
 
         return False
 
-    def requires_root(self, action: str, pkg: SoftwarePackage):
+    def requires_root(self, action: SoftwareAction, pkg: SoftwarePackage) -> bool:
         return False
 
     def _update_env_settings(self, task_manager: TaskManager = None):
diff --git a/bauh/view/core/controller.py b/bauh/view/core/controller.py
index 5bb0a70d..0fca3f37 100755
--- a/bauh/view/core/controller.py
+++ b/bauh/view/core/controller.py
@@ -7,7 +7,7 @@ from threading import Thread
 from typing import List, Set, Type, Tuple, Dict
 
 from bauh.api.abstract.controller import SoftwareManager, SearchResult, ApplicationContext, UpgradeRequirements, \
-    UpgradeRequirement, TransactionResult
+    UpgradeRequirement, TransactionResult, SoftwareAction
 from bauh.api.abstract.disk import DiskCacheLoader
 from bauh.api.abstract.handler import ProcessWatcher, TaskManager
 from bauh.api.abstract.model import SoftwarePackage, PackageUpdate, PackageHistory, PackageSuggestion, \
@@ -151,14 +151,14 @@ class GenericSoftwareManager(SoftwareManager):
             res.installed.extend(apps_found.installed)
             res.new.extend(apps_found.new)
 
-    def search(self, word: str, disk_loader: DiskCacheLoader = None, limit: int = -1, is_url: bool = False) -> SearchResult:
+    def search(self, words: str, disk_loader: DiskCacheLoader = None, limit: int = -1, is_url: bool = False) -> SearchResult:
         ti = time.time()
         self._wait_to_be_ready()
 
         res = SearchResult([], [], 0)
 
         if self.context.is_internet_available():
-            norm_word = word.strip().lower()
+            norm_word = words.strip().lower()
 
             url_words = RE_IS_URL.match(norm_word)
             disk_loader = self.disk_loader_factory.new()
@@ -385,7 +385,7 @@ class GenericSoftwareManager(SoftwareManager):
             if man:
                 return man.cache_to_disk(pkg, icon_bytes=icon_bytes, only_icon=only_icon)
 
-    def requires_root(self, action: str, app: SoftwarePackage) -> bool:
+    def requires_root(self, action: SoftwareAction, app: SoftwarePackage) -> bool:
         if app is None:
             if self.managers:
                 for man in self.managers:
diff --git a/bauh/view/qt/prepare.py b/bauh/view/qt/prepare.py
index 04b1287b..752bcd46 100644
--- a/bauh/view/qt/prepare.py
+++ b/bauh/view/qt/prepare.py
@@ -10,7 +10,7 @@ from PyQt5.QtWidgets import QWidget, QVBoxLayout, QLabel, QSizePolicy, QTableWid
 
 from bauh import __app_name__
 from bauh.api.abstract.context import ApplicationContext
-from bauh.api.abstract.controller import SoftwareManager
+from bauh.api.abstract.controller import SoftwareManager, SoftwareAction
 from bauh.api.abstract.handler import TaskManager
 from bauh.view.qt.components import new_spacer, QCustomToolbar
 from bauh.view.qt.qt_utils import centralize
@@ -51,7 +51,7 @@ class Prepare(QThread, TaskManager):
 
     def run(self):
         root_pwd = None
-        if self.manager.requires_root('prepare', None):
+        if self.manager.requires_root(SoftwareAction.PREPARE, None):
             ok, root_pwd = self.ask_password()
 
             if not ok:
diff --git a/bauh/view/qt/thread.py b/bauh/view/qt/thread.py
index 1537eebe..444f8106 100644
--- a/bauh/view/qt/thread.py
+++ b/bauh/view/qt/thread.py
@@ -14,7 +14,7 @@ from PyQt5.QtWidgets import QWidget
 
 from bauh import LOGS_PATH
 from bauh.api.abstract.cache import MemoryCache
-from bauh.api.abstract.controller import SoftwareManager, UpgradeRequirement, UpgradeRequirements
+from bauh.api.abstract.controller import SoftwareManager, UpgradeRequirement, UpgradeRequirements, SoftwareAction
 from bauh.api.abstract.handler import ProcessWatcher
 from bauh.api.abstract.model import PackageStatus, SoftwarePackage, CustomSoftwareAction
 from bauh.api.abstract.view import MessageType, MultipleSelectComponent, InputOption, TextComponent, \
@@ -29,7 +29,7 @@ from bauh.view.qt import commons
 from bauh.view.qt.view_model import PackageView, PackageViewStatus
 from bauh.view.util.translation import I18n
 
-RE_VERSION_IN_NAME = re.compile(r'\s+version\s+[\w\.]+\s*$')
+RE_VERSION_IN_NAME = re.compile(r'\s+version\s+[\w.]+\s*$')
 
 
 class AsyncAction(QThread, ProcessWatcher):
@@ -48,7 +48,7 @@ class AsyncAction(QThread, ProcessWatcher):
         super(AsyncAction, self).__init__()
         self.wait_confirmation = False
         self.confirmation_res = None
-        self.root_password = None
+        self.root_password = root_password
         self.stop = False
 
     def request_confirmation(self, title: str, body: str, components: List[ViewComponent] = None,
@@ -123,64 +123,78 @@ class AsyncAction(QThread, ProcessWatcher):
 
         return False
 
-    def _generate_backup(self, app_config: dict, i18n: I18n, root_password: str) -> bool:
-        if timeshift.is_available():
-            if app_config['backup']['mode'] not in ('only_one', 'incremental'):
-                self.show_message(title=self.i18n['error'].capitalize(),
-                                  body='{}: {}'.format(self.i18n['action.backup.invalid_mode'], bold(app_config['backup']['mode'])),
-                                  type_=MessageType.ERROR)
-                return False
+    def _generate_backup(self, app_config: dict, i18n: I18n, root_password: Optional[str]) -> bool:
+        if app_config['backup']['mode'] not in ('only_one', 'incremental'):
+            self.show_message(title=self.i18n['error'].capitalize(),
+                              body='{}: {}'.format(self.i18n['action.backup.invalid_mode'],bold(app_config['backup']['mode'])),
+                              type_=MessageType.ERROR)
+            self.change_substatus('')
+            return False
 
-            if not user.is_root() and not root_password:
-                root_pwd, valid = self.request_root_password()
-            else:
-                root_pwd, valid = root_password, True
+        handler = ProcessHandler(self)
+        if app_config['backup']['mode'] == 'only_one':
+            self.change_substatus('[{}] {}'.format(i18n['core.config.tab.backup'].lower(), i18n['action.backup.substatus.delete']))
+            deleted, _ = handler.handle_simple(timeshift.delete_all_snapshots(root_password))
 
-            if not valid:
-                return False
-
-            handler = ProcessHandler(self)
-            if app_config['backup']['mode'] == 'only_one':
-                self.change_substatus('[{}] {}'.format(i18n['core.config.tab.backup'].lower(), i18n['action.backup.substatus.delete']))
-                deleted, _ = handler.handle_simple(timeshift.delete_all_snapshots(root_pwd))
-
-                if not deleted and not self.request_confirmation(title=i18n['core.config.tab.backup'],
-                                                                 body='{}. {}'.format(i18n['action.backup.error.delete'], i18n['action.backup.error.proceed']),
-                                                                 confirmation_label=i18n['yes'].capitalize(),
-                                                                 deny_label=i18n['no'].capitalize()):
-                    return False
-
-            self.change_substatus('[{}] {}'.format(i18n['core.config.tab.backup'].lower(), i18n['action.backup.substatus.create']))
-            created, _ = handler.handle_simple(timeshift.create_snapshot(root_pwd, app_config['backup']['type']))
-
-            if not created and not self.request_confirmation(title=i18n['core.config.tab.backup'],
-                                                             body='{}. {}'.format(i18n['action.backup.error.create'],
+            if not deleted and not self.request_confirmation(title=i18n['core.config.tab.backup'],
+                                                             body='{}. {}'.format(i18n['action.backup.error.delete'],
                                                                                   i18n['action.backup.error.proceed']),
                                                              confirmation_label=i18n['yes'].capitalize(),
                                                              deny_label=i18n['no'].capitalize()):
+                self.change_substatus('')
                 return False
 
+        self.change_substatus('[{}] {}'.format(i18n['core.config.tab.backup'].lower(), i18n['action.backup.substatus.create']))
+        created, _ = handler.handle_simple(timeshift.create_snapshot(root_password, app_config['backup']['type']))
+
+        if not created and not self.request_confirmation(title=i18n['core.config.tab.backup'],
+                                                         body='{}. {}'.format(i18n['action.backup.error.create'],
+                                                                              i18n['action.backup.error.proceed']),
+                                                         confirmation_label=i18n['yes'].capitalize(),
+                                                         deny_label=i18n['no'].capitalize()):
+            self.change_substatus('')
+            return False
+
+        self.change_substatus('')
         return True
 
-    def request_backup(self, app_config: dict, key: str, i18n: I18n, root_password: str = None) -> bool:
-        if bool(app_config['backup']['enabled']) and timeshift.is_available():
-            val = app_config['backup'][key] if key else None
+    def _check_backup_requirements(self, app_config: dict, pkg: Optional[PackageView], action_key: Optional[str]) -> bool:
+        if pkg and not pkg.model.supports_backup():
+            return False
 
-            if val is None:  # ask mode
-                if self.request_confirmation(title=i18n['core.config.tab.backup'],
+        if action_key and app_config['backup'][action_key] is False:
+            return False
+
+        return bool(app_config['backup']['enabled']) and timeshift.is_available()
+
+    def _should_backup(self, action_key: str, app_config: dict, i18n: I18n) -> bool:
+        # backup -> true: do not ask, only execute | false: do not ask or execute | None: ask
+        backup = app_config['backup'][action_key] if action_key else None
+
+        if backup is None:
+            return self.request_confirmation(title=i18n['core.config.tab.backup'],
                                              body=i18n['action.backup.msg'],
                                              confirmation_label=i18n['yes'].capitalize(),
-                                             deny_label=i18n['no'].capitalize()):
-                    res = self._generate_backup(app_config, i18n, root_password)
-                    self.change_substatus('')
-                    return res
+                                             deny_label=i18n['no'].capitalize())
+        else:
+            return backup
 
-            elif val is True:  # direct mode
-                res = self._generate_backup(app_config, i18n, root_password)
-                self.change_substatus('')
-                return res
+    def request_backup(self, action_key: Optional[str], pkg: Optional[PackageView], i18n: I18n, app_config: dict, root_password: Optional[str], backup_only: bool = False) -> Tuple[bool, Optional[str]]:
+        if not backup_only:
+            if not self._check_backup_requirements(app_config=app_config, pkg=pkg, action_key=action_key):
+                return True, root_password
 
-        return True
+            if not self._should_backup(action_key=action_key, app_config=app_config, i18n=i18n):
+                return True, root_password
+
+        pwd = root_password
+        if not user.is_root() and pwd is None:
+            valid_password, pwd = self.request_root_password()
+
+            if not valid_password:
+                return False, None
+
+        return self._generate_backup(app_config=app_config, i18n=i18n, root_password=pwd), pwd
 
 
 class UpgradeSelected(AsyncAction):
@@ -373,15 +387,29 @@ class UpgradeSelected(AsyncAction):
             traceback.print_exc()
 
     def run(self):
-        valid_password, root_password = self._request_password()
+        root_user = user.is_root()
+        to_update, upgrade_requires_root, bkp_supported = [], False, False
+
+        for pkg in self.pkgs:
+            if pkg.model.update and not pkg.model.is_update_ignored() and pkg.update_checked:
+                to_update.append(pkg)
+
+                if not bkp_supported and pkg.model.supports_backup():
+                    bkp_supported = True
+
+                if not root_user and not upgrade_requires_root and self.manager.requires_root(SoftwareAction.UPGRADE, pkg.model):
+                    upgrade_requires_root = True
+
+        if upgrade_requires_root:
+            valid_password, root_password = self._request_password()
+        else:
+            valid_password, root_password = True, None
 
         if not valid_password:
             self.notify_finished({'success': False, 'updated': 0, 'types': set(), 'id': None})
             self.pkgs = None
             return
 
-        to_update = [pkg for pkg in self.pkgs if pkg.model.update and not pkg.model.is_update_ignored() and pkg.update_checked]
-
         if len(to_update) > 1:
             self.disable_progress_controll()
         else:
@@ -440,26 +468,37 @@ class UpgradeSelected(AsyncAction):
 
         app_config = read_config()
 
-        # trim dialog
+        # backup dialog ( if enabled, supported and accepted )
+        should_backup = bkp_supported
+        should_backup = should_backup and self._check_backup_requirements(app_config=app_config, pkg=None, action_key='upgrade')
+        should_backup = should_backup and self._should_backup(action_key='upgrade', app_config=app_config, i18n=self.i18n)
+
+        # trim dialog ( if enabled and accepted )
         if app_config['disk']['trim']['after_upgrade'] is not False:
             should_trim = app_config['disk']['trim']['after_upgrade'] or self._ask_for_trim()
         else:
             should_trim = False
 
-        # backup process ( if enabled, supported and accepted )
-        if bool(app_config['backup']['enabled']) and app_config['backup']['upgrade'] in (True, None) and timeshift.is_available():
-            any_requires_bkp = False
+        if should_trim and not root_user and root_password is None:  # trim requires root and the password might have not being asked yet
+            valid_password, root_password = self._request_password()
 
-            for dep in requirements.to_upgrade:
-                if dep.pkg.supports_backup():
-                    any_requires_bkp = True
-                    break
+            if not valid_password:
+                self.notify_finished({'success': False, 'updated': 0, 'types': set(), 'id': None})
+                self.pkgs = None
+                return
 
-            if any_requires_bkp:
-                if not self.request_backup(app_config, 'upgrade', self.i18n, root_password):
-                    self.notify_finished({'success': success, 'updated': updated, 'types': updated_types, 'id': None})
-                    self.pkgs = None
-                    return
+        # performing backup
+        if should_backup:
+            proceed, root_password = self.request_backup(action_key='upgrade',
+                                                         app_config=app_config,
+                                                         i18n=self.i18n,
+                                                         root_password=root_password,
+                                                         pkg=None,
+                                                         backup_only=True)
+            if not proceed:
+                self.notify_finished({'success': False, 'updated': 0, 'types': set(), 'id': None})
+                self.pkgs = None
+                return
 
         self.change_substatus('')
 
@@ -497,7 +536,8 @@ class RefreshApps(AsyncAction):
 
     def run(self):
         try:
-            res = self.manager.read_installed(pkg_types=self.pkg_types)
+            res = self.manager.read_installed(pkg_types=self.pkg_types, disk_loader=None, only_apps=False,
+                                              internet_available=True, limit=-1)
             refreshed_types = set()
 
             if res:
@@ -528,12 +568,16 @@ class UninstallPackage(AsyncAction):
 
     def run(self):
         if self.pkg:
-            if self.pkg.model.supports_backup():
-                if not self.request_backup(read_config(), 'uninstall', self.i18n, self.root_pwd):
-                    self.notify_finished(False)
-                    self.pkg = None
-                    self.root_pwd = None
-                    return
+            proceed, _ = self.request_backup(action_key='uninstall',
+                                             pkg=self.pkg,
+                                             i18n=self.i18n,
+                                             root_password=self.root_pwd,
+                                             app_config=read_config())
+            if not proceed:
+                self.notify_finished({'success': False, 'removed': None, 'pkg': self.pkg})
+                self.pkg = None
+                self.root_pwd = None
+                return
 
             try:
                 res = self.manager.uninstall(self.pkg.model, self.root_pwd, self, None)
@@ -567,12 +611,17 @@ class DowngradePackage(AsyncAction):
         if self.pkg:
             success = False
 
-            if self.pkg.model.supports_backup():
-                if not self.request_backup(read_config(), 'downgrade', self.i18n, self.root_pwd):
-                    self.notify_finished({'app': self.pkg, 'success': success})
-                    self.pkg = None
-                    self.root_pwd = None
-                    return
+            proceed, _ = self.request_backup(action_key='downgrade',
+                                             pkg=self.pkg,
+                                             i18n=self.i18n,
+                                             root_password=self.root_pwd,
+                                             app_config=read_config())
+
+            if not proceed:
+                self.notify_finished({'app': self.pkg, 'success': success})
+                self.pkg = None
+                self.root_pwd = None
+                return
 
             try:
                 success = self.manager.downgrade(self.pkg.model, self.root_pwd, self)
@@ -630,7 +679,7 @@ class SearchPackages(AsyncAction):
 
         if self.word:
             try:
-                res = self.manager.search(self.word)
+                res = self.manager.search(words=self.word, disk_loader=None, limit=-1, is_url=False)
                 search_res['pkgs_found'].extend(res.installed)
                 search_res['pkgs_found'].extend(res.new)
             except NoInternetException:
@@ -654,10 +703,17 @@ class InstallPackage(AsyncAction):
         if self.pkg:
             res = {'success': False, 'installed': None, 'removed': None, 'pkg': self.pkg}
 
-            if self.pkg.model.supports_backup():
-                if not self.request_backup(read_config(), 'install', self.i18n, self.root_pwd):
-                    self.signal_finished.emit(res)
-                    return
+            proceed, _ = self.request_backup(action_key='install',
+                                             pkg=self.pkg,
+                                             i18n=self.i18n,
+                                             root_password=self.root_pwd,
+                                             app_config=read_config())
+
+            if not proceed:
+                self.signal_finished.emit(res)
+                self.pkg = None
+                self.root_pwd = None
+                return
 
             try:
                 transaction_res = self.manager.install(self.pkg.model, self.root_pwd, None, self)
@@ -834,7 +890,7 @@ class ListWarnings(QThread):
         self.man = man
 
     def run(self):
-        warnings = self.man.list_warnings()
+        warnings = self.man.list_warnings(internet_available=True)
         if warnings:
             self.signal_warnings.emit(warnings)
 
@@ -949,8 +1005,12 @@ class CustomAction(AsyncAction):
 
     def run(self):
         if self.custom_action.backup:
-            app_config = read_config()
-            if not self.request_backup(app_config, None, self.i18n, self.root_pwd):
+            proceed, _ = self.request_backup(app_config=read_config(),
+                                             action_key=None,
+                                             i18n=self.i18n,
+                                             root_password=self.root_pwd,
+                                             pkg=self.pkg)
+            if not proceed:
                 self.notify_finished({'success': False, 'pkg': self.pkg, 'action': self.custom_action})
                 self.pkg = None
                 self.custom_action = None
diff --git a/bauh/view/qt/window.py b/bauh/view/qt/window.py
index fb4d348b..dfda10ec 100755
--- a/bauh/view/qt/window.py
+++ b/bauh/view/qt/window.py
@@ -14,7 +14,7 @@ from PyQt5.QtWidgets import QWidget, QVBoxLayout, QCheckBox, QHeaderView, QToolB
 from bauh import LOGS_PATH
 from bauh.api.abstract.cache import MemoryCache
 from bauh.api.abstract.context import ApplicationContext
-from bauh.api.abstract.controller import SoftwareManager
+from bauh.api.abstract.controller import SoftwareManager, SoftwareAction
 from bauh.api.abstract.model import SoftwarePackage
 from bauh.api.abstract.view import MessageType
 from bauh.api.http import HttpClient
@@ -712,7 +712,7 @@ class ManageWindow(QWidget):
         self._finish_search(res)
 
     def begin_uninstall(self, pkg: PackageView):
-        pwd, proceed = self._ask_root_password('uninstall', pkg)
+        pwd, proceed = self._ask_root_password(SoftwareAction.UNINSTALL, pkg)
 
         if not proceed:
             return
@@ -1160,7 +1160,7 @@ class ManageWindow(QWidget):
         self.progress_controll_enabled = True
 
     def begin_downgrade(self, pkg: PackageView):
-        pwd, proceed = self._ask_root_password('downgrade', pkg)
+        pwd, proceed = self._ask_root_password(SoftwareAction.DOWNGRADE, pkg)
 
         if not proceed:
             return
@@ -1281,7 +1281,7 @@ class ManageWindow(QWidget):
             self.comp_manager.restore_state(ACTION_SEARCH)
             dialog.show_message(title=self.i18n['warning'].capitalize(), body=self.i18n[res['error']], type_=MessageType.WARNING)
 
-    def _ask_root_password(self, action: str, pkg: PackageView) -> Tuple[Optional[str], bool]:
+    def _ask_root_password(self, action: SoftwareAction, pkg: PackageView) -> Tuple[Optional[str], bool]:
         pwd = None
         requires_root = self.manager.requires_root(action, pkg.model)
 
@@ -1293,7 +1293,7 @@ class ManageWindow(QWidget):
         return pwd, True
 
     def install(self, pkg: PackageView):
-        pwd, proceed = self._ask_root_password('install', pkg)
+        pwd, proceed = self._ask_root_password(SoftwareAction.INSTALL, pkg)
 
         if not proceed:
             return
diff --git a/bauh/view/resources/locale/ca b/bauh/view/resources/locale/ca
index 033dd19b..74115bd9 100644
--- a/bauh/view/resources/locale/ca
+++ b/bauh/view/resources/locale/ca
@@ -58,7 +58,7 @@ action.cancelled=l’usuari ha cancel·lat l’operació
 action.disk_trim=Optimizing disc (TRIM)
 action.disk_trim.error=There was a problem while optimizing the disk
 action.failed=L'acció ha fallat
-action.history.no_history.body=There is no available history for {}
+action.history.no_history.body=There is no history available for {}
 action.history.no_history.title=No history
 action.ignore_updates.fail=It was not possible to ignore updates from {}
 action.ignore_updates.success=Updates from {} will be ignored from now on
diff --git a/bauh/view/resources/locale/de b/bauh/view/resources/locale/de
index acce8a67..86df0dfb 100644
--- a/bauh/view/resources/locale/de
+++ b/bauh/view/resources/locale/de
@@ -58,7 +58,7 @@ action.cancelled=Aktion vom Nutzer abgebrochen
 action.disk_trim=Optimizing disc (TRIM)
 action.disk_trim.error=There was a problem while optimizing the disk
 action.failed=Aktion fehlgeschlagen
-action.history.no_history.body=There is no available history for {}
+action.history.no_history.body=There is no history available for {}
 action.history.no_history.title=No history
 action.ignore_updates.fail=It was not possible to ignore updates from {}
 action.ignore_updates.success=Updates from {} will be ignored from now on
diff --git a/bauh/view/resources/locale/en b/bauh/view/resources/locale/en
index 6022d3f3..3d9e1bf5 100644
--- a/bauh/view/resources/locale/en
+++ b/bauh/view/resources/locale/en
@@ -58,7 +58,7 @@ action.cancelled=operation cancelled by the user
 action.disk_trim.error=There was a problem while optimizing the disk
 action.disk_trim=Optimizing disc (TRIM)
 action.failed=Action failed
-action.history.no_history.body=There is no available history for {}
+action.history.no_history.body=There is no history available for {}
 action.history.no_history.title=No history
 action.ignore_updates.fail=It was not possible to ignore updates from {}
 action.ignore_updates.success=Updates from {} will be ignored from now on
diff --git a/bauh/view/resources/locale/es b/bauh/view/resources/locale/es
index 559709a7..d51a49c1 100644
--- a/bauh/view/resources/locale/es
+++ b/bauh/view/resources/locale/es
@@ -58,7 +58,7 @@ action.cancelled=operación cancelada por el usuario
 action.disk_trim=Optimizando el disco (TRIM)
 action.disk_trim.error=Hubo un problema al optimizar el disco
 action.failed=Acción fallida
-action.history.no_history.body=There is no available history for {}
+action.history.no_history.body=No hay historial disponible para {}
 action.history.no_history.title=No history
 action.ignore_updates.fail=No fue posible ignorar las actualizaciones de {}
 action.ignore_updates.success=Las actualizaciones de {} serán ignoradas de ahora en adelante
diff --git a/bauh/view/resources/locale/it b/bauh/view/resources/locale/it
index d826458f..2df5a280 100644
--- a/bauh/view/resources/locale/it
+++ b/bauh/view/resources/locale/it
@@ -58,7 +58,7 @@ action.cancelled=operazione annullata dall'utente
 action.disk_trim=Optimizing disc (TRIM)
 action.disk_trim.error=There was a problem while optimizing the disk
 action.failed=Azione non riuscita
-action.history.no_history.body=There is no available history for {}
+action.history.no_history.body=There is no history available for {}
 action.history.no_history.title=No history
 action.ignore_updates.fail=It was not possible to ignore updates from {}
 action.ignore_updates.success=Updates from {} will be ignored from now on
diff --git a/bauh/view/resources/locale/ru b/bauh/view/resources/locale/ru
index fcdd0df4..7334d122 100644
--- a/bauh/view/resources/locale/ru
+++ b/bauh/view/resources/locale/ru
@@ -58,7 +58,7 @@ action.cancelled=Операция отменена пользователем
 action.disk_trim=Optimizing disc (TRIM)
 action.disk_trim.error=There was a problem while optimizing the disk
 action.failed=Действие не удалось
-action.history.no_history.body=There is no available history for {}
+action.history.no_history.body=There is no history available for {}
 action.history.no_history.title=No history
 action.ignore_updates.fail=It was not possible to ignore updates from {}
 action.ignore_updates.success=Updates from {} will be ignored from now on