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SBS 2011 Cannot Add Removable disk to Backup

If you have a Scheduled Windows Server Backup set up in SBS 2011 (or Server 2008R2) you may get the following error message when you try to add a new removable disk: "The filename, directory name, or volume label syntax is incorrect".

This is a fault.  It can be fixed either by

1) Connecting all existing backup disks to the system and trying again, or

2) Using the WBadmin command to add the new disk, per this Microsoft article.