Troubleshooting MS SQL backups

In most cases uncompleted MS SQL backup sessions are restarted automatically. However, if an error persists, you can try these steps for troubleshooting:

  1. Make sure the required shadow copy services are running, by using the vssadmin list writers command:
    • SQL Writer Service
    • Volume Shadow Copy
  2. Check for error messages in application event logs

    See Logging for details

  3. Make sure there is enough free space in the VSS Shadow Copy storage area (otherwise the system can start deleting snapshots required for backups)

If none of the above helps, please contact Backup support for assistance.