fix(backups): Do not shut down the service during backup

We do not want the user to expirience outages during automatic backups.
Generally, they are not even needed.
We should use hooks to service-specific tasks, such as
creating the database dump, so we don't have to shut down Postgres.

selfprivacy_api/backup/__init__.py

@@ -4,8 +4,10 @@ from typing import List, Optional
 
 from selfprivacy_api.utils import ReadUserData, WriteUserData
 
-from selfprivacy_api.services import get_service_by_id
-from selfprivacy_api.services import get_all_services
+from selfprivacy_api.services import (
+    get_service_by_id,
+    get_all_services,
+)
 from selfprivacy_api.services.service import (
     Service,
     ServiceStatus,
@@ -210,15 +212,13 @@ class Backups:
         Jobs.update(job, status=JobStatus.RUNNING)
 
         try:
-            with StoppedService(service):
-                Backups.assert_dead(service)  # to be extra sure
-                service.pre_backup()
-                snapshot = Backups.provider().backupper.start_backup(
-                    folders,
-                    tag,
-                )
-                Backups._store_last_snapshot(tag, snapshot)
-                service.post_restore()
+            service.pre_backup()
+            snapshot = Backups.provider().backupper.start_backup(
+                folders,
+                tag,
+            )
+            Backups._store_last_snapshot(tag, snapshot)
+            service.post_restore()
         except Exception as e:
             Jobs.update(job, status=JobStatus.ERROR)
             raise e
@@ -489,9 +489,12 @@ class Backups:
 
     @staticmethod
     def assert_dead(service: Service):
-        # if we backup the service that is failing to restore it to the
-        # previous snapshot, its status can be FAILED
-        # And obviously restoring a failed service is the main route
+        """
+
+        If we backup the service that is failing to restore it to the previous snapshot,
+        its status can be FAILED.
+        And obviously restoring a failed service is the main route
+        """
         if service.get_status() not in [
             ServiceStatus.INACTIVE,
             ServiceStatus.FAILED,