When you try to add an additional disk to a scheduled backup by using the Windows Server Backup Schedule Wizard, you may receive the following error message:
"The filename, directory name, or volume label syntax is incorrect"
This problem may occur if a previously-added destination disk is not currently attached to the server. When the wizard completes, the currently-listed destination disks are verified. If any of these disks are missing, you receive the error message that is described in the "Symptoms" section.
To resolve this issue, use one of the following options.
Note To configure or modify a daily backup schedule, you must be a member of the Administrators group. In addition, you must run the wbadmin command from an elevated command prompt. To open an elevated command prompt, click Start, right-click Command Prompt, and then click Run as administrator.
Note If you are using offsite storage, or if another situation prevents all destination disks from being attached at the same time, go to option 3.
If the missing disk is no longer available, remove it as a destination disk from the backup wizard.
Note If the missing disk is the only destination disk that is defined in the backup schedule, you will receive the following error message when you try to remove it. If this occurs, click Stop backup, and then create a new backup schedule.
"Error: You cannot remove this backup storage destination unless you add another storage destination or stop the scheduled backup. A schedule backup requires at least one backup storage destination.
To remove a destination disk from a scheduled backup, follow these steps:
Add a new disk to the backup schedule by running the wbadmin command from an elevated command prompt.
"Do you want to enable scheduled backups with the above settings?"
What's New in Windows Server Backup on Windows Server 2008 R2Webadmin