When we are backing up backup MSSQL, we create a snapshot with the help of the VSS of MS SQL databases.
The following actions below can lead to an error causing loss of the snapshot:
- rebooting the server during the backup of MS SQL;
- restarting the DataShield Back and Recovery Service Controller during the backup of MS SQL;
- restarting the MS SQL writer or the VSS during the backup of MS SQL.
Most likely, this is a temporary issue and next backup will be successful.
NOTE: There is also a chance that the system deleted the snapshot by itself. You should check event logs in the time frame ±10 minutes of the fail. In case VolSnap deletes the shapshot, you should tune your system to prevent it.
To resolve this problem we suggest to restart SQL Server VSS Writer, And try to backup again.