Workaround?
How about this as a workaround?
1) Write an AppleScript that first checks for the presence of the desired external drive. If not, have it pop up a display dialog with the appropriate reminder text & cancel & OK buttons. Then have the script run SuperDuper with the desired settings document.
2) Schedule this AppleScript with iCal. Set the iCal event to repeat on the desired backup schedule.
It would take a little work but would be easily customizable ....
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