What version of BE you are using? Could you post exact error message from the job log.
Also let us know if you are getting this error for any specific machine.
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If the server having this error is a DC, then the system state contains AD and it can only be backed up if the BESA is a domain admin
Also, make sure that you have turned on AOFO
My back exec version 2012.... the error shows in server itself..
Refer to the below article
Okie Brother .ty it will helpful to us...