[dnanian]

If you erase the drive "outside" SuperDuper, you change its UUID, and we can't find it any more (we don't go by the name, we go by its low-level identifier -- that way you *can*rename it and it'll still work).

To fix it, you can either open the settings (they're in ~/Library/Application Support/Scheduled Copies) and set the proper drive, then save or delete and recreate the scheduled item.