Dave wrote via email:
"Generally, force quitting programs when they're not actually unresponsive is unwise. But that wasn't really what was wrong here."
Well, then I wonder what did go wrong. Why did my SuperDuper backup script fail to mount my sparseimage? I tried it several times, even after rebooting. It was not a case of my external USB drive going offline, as far as I know. I hope the problem does not recur.
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