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Windows Server Backup Failing

I have a server running 2008 R2 that is set to backup daily with Windows Server Backup.  Problem is, the backup keeps failing.  The error that I get every time is:

"The backup operation that started at '¿2011¿-¿10¿-¿21T18:02:40.464000000Z' has failed with following error code '2155348041' (None of the source volumes were backed up.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved."

The event details only relist the time and error code.  I've done some looking, and I don't see this error code officially documented.  Could someone here tell me what's going wrong?

Thanks in advance!
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TheCleaner
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Is the server running Hyper V as well?  Can you set a backup to just backup a single folder and see if it completes successfully?
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I tried to do a backup of one folder on the C: drive to a network location, and got this error:

"The backup operation that started at '¿2011¿-¿10¿-¿21T19:58:11.437753700Z' has failed with following error code '2155348301' (There was a failure in updating the backup for deleted items.). Please review the event details for a solution, and then rerun the backup operation once the issue is resolved."

This server is not running Hyper-V.
Try to back it up to a local drive first.  What kind of network location are you backing it up to?  A Windows share?
I tried backing up to my flash drive, but Windows Server Backup didn't list it as an option for a destination.  I finally ended up reformatting the volume I was using to backup to, and now my scheduled backups are running without issue.

Second question: is there any way to set Windows Server Backup to backup to a hot swap drive?  (i.e. I change the physical drive every week, and Windows Server Backup runs a backup to whichever drive is available?)
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