Backup fails with "Selected network files or network folders were not found: <NETWORK PATH>"
You are backing up files or folders on a network share and these files/folders are not available or credentials are incorrect.
From the error message, note which files/folders could not be found.
Verify that credentials specified in the plan are still accepted when accessing the share. You might get this error when credentials to the network share have been changed. Edit the plan and change credentials:
Verify that these files/folders still exist and are accessible for Acronis Agent. Possible root causes could be:
Items have been moved/deleted. Specify new location in the backup plan or remove them from items to back up.
Items have been renamed. Re-select these items in the backup plan.
Share is no longer accessible. Make sure the folders are still shared (right-click -> Properties -> Sharing -> Share -> make sure the folder is shared and is accessible for everyone or Administrators/Acronis Agent user specifically).