Error: The specified file name in the file spec is invalid Print

When performing a MS Windows System backup, the following error message is received in the backup report:
The specified file name in the file  spec is invalid

Resolution: As a workaround, please:

1. Unselect the 'Include all critical volumes' option from the affected backup set in the "Backup Source" section of the backup client
2. Save setting
3. Then reselect the 'Include all critical volumes' option for the affected backup set.