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adding disk target to existing windows backup

If you need to add a new external disk to an already configured Windows Backup rotation, run the following commands from an elevated command prompt after connecting the new disk.
wbadmin get disks
WBADMIN ENABLE BACKUP -addtarget:{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}

Use the results from the first command to ID you new disk(s) and enter the respective disk ID into the second command to add it to the rotation.