When a backup of a System State is performed, a snapshot of data is created with the help of the VSS of System State.
Several actions can lead to the error causing the snapshot loss:
- Re-booting the server during the backup of System State.
- Restarting the DataShield Back and Recovery service controller during the backup of System State.
- Restarting VSS during the backup of System State.
In most cases this issue is temporary and the next backup will be successful.
NOTE: The system can delete a snapshot by itself.
Check event logs in the time frame of approximately 10 minutes of the backup failure.
In case VolSnap deletes the snapshot, you should tune your system to prevent that.