Hi,
As far as I know, different apps have different backup policy. May I ask what application you use for the backup?
Here’s a link related to Windows server backup for your reference:
https://learn.microsoft.com/en-us/windows-server-essentials/support/troubleshoot-computer-backup-and-restore-errors-in-windows-server-essentials
Thanks for your time.
Best regards,
Danny
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