I have a Windows Server 2012 R2 machine running as a Domain Controller which seems to be randomly failing backups when it comes to the system state. I am running full backup every hour. On average, a successful backup will take no longer than 15 minutes. I have seen it fail sometimes nine times in a row so I doubt that it is the length of the backup preventing this. I do have a cloud backup software (Carbonite) that runs nightly and am not ruling this program out. I am making my backups to an external RAID array directly attached to the server via eSATA.
Some of the errors that show up in wbadmin are:
- The operation ended before completion. Detailed error: Another shadow copy creation is already in progress. Wait a few moments and try again. (the previous and subsequent backup were successful)
- The backup operation of the volume did not start. (In this error, nothing was backed up and the status says "The operation failed because another operation was in progress. This one occurred six of nine times in the 9x failed backup tries.
In just about all cases it is the system state where the backup fails. In Event Viewer I see these Errors mentioned:
- 0x80780034
- 0x80780017