The Turn off the ability to back up data files machine setting should be configured correctly. This setting lets you disable the data file backup functionality. If this setting is enabled, users cannot back up data files. If this setting is disabled or not configured, users can back up data files. Fix: (1) GPO: Computer Configuration\Administrative Templates\Windows Components\Backup\Client\Turn off the ability to back up data files (2) KEY: HKLM\Software\Policies\Microsoft\Windows\Backup\Client\DisableBackupUI