99% of time (at least for me), any backup failure with VSS in the name is
most likely due to missing MS VSS patches.  I did not see what version of
Windows you are running, but check this page:

http://social.technet.microsoft.com/Forums/en-US/winserverfiles/thread/52689b9e-411b-4116-9545-4c4d2b7b9da4/

On Wed, Apr 3, 2013 at 10:14 AM, SOV <tsm-forum AT backupcentral DOT com> wrote:

> 04/01/2013 23:10:16 ANS1512E Scheduled event 'XXXXXX failed.  Return code
> = 12.
> 04/02/2013 23:00:44 ANS5250E An unexpected error was encountered.
>    TSM function name : baHandleSnapshot
>    TSM function      : DVssSnapshot::initializeSnapshot():
> VSS[AddToSnapshotSet: VSS_E_UNEXPECTED_PROVIDER_ERROR (See the Microsoft
> Application event log for additional VSS messages).
>    TSM return code   : -1
>    TSM file          : incrdrv.cpp (9695)
> 04/02/2013 23:00:44 ANS1327W The snapshot operation for
> 'XXXXX\SystemState\NULL\System State\SystemState' failed with error code:
> -1.
> 04/02/2013 23:00:45 ANS1228E Sending of object
> 'XXXXX\SystemState\NULL\System State\SystemState' failed
> 04/02/2013 23:00:45 ANS5283E The operation was unsuccessful.
>
> 04/02/2013 23:00:45 ANS1375E The snapshot operation failed.
>
> Please advise
>
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Virginia Commonwealth University
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