[greengrass]

I back up regularly with SD using Smart Update All Files. Occasionally I swap out the backup drive to keep a copy off site. The two backup drives are identically named. However, after swapping drives, the regularly scheduled backup fails with error message "The automatic copy aborted because SuperDuper! could not locate the Destination volume named G4iMac Clone." This despite the fact that the G4iMac Clone backup is successfully mounted in the Finder. I know I can delete and recreate the schedule to get the backup to work but why do I get the error and how can I avoid it in the future?