Backups fail and Event ID 12293 is logged on a computer that is running Windows Vista or Windows Server 2008
You try to perform a backup on a computer that is running Windows Vista or Windows Server 2008. However, the backup stops immediately after it starts. Additionally, the following event is logged in the Application log:
Event ID: 12293
Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB972135.