Symptom
When we try to add another destination disk (USB hard disk) to the scheduled backup via Windows Server Backup UI, it fails if not all destination USB drives are currently attached. You receive the following error message:
The filename, directory name, or volume label is incorrect.
Cause
Currently, there are some problems in the Windows Server Backup modify schedule task wizard.
Workaround
To work around this issue, please use the WBADMIN command line tool to add disk.
WBADMIN ENABLE BACKUP -addtarget:{DiskID}
The AddTarget parameter takes disk ID as parameter. It can be retrieved by running "WBADMIN GET DISKS" command.
Example:
WBADMIN ENABLE BACKUP -addtarget:{aa123d14-bba0-1dd9-0d93-80aaaa6bbb63}
NOTE: You must run wbadmin from an elevated command prompt.
More Information
Wbadmin
http://technet.microsoft.com/en-us/library/cc754015(WS.10).aspx
Applies to
Windows Server 2008 R2