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This feature seeems awfully "dangerous" to me. I understand the convenience aspect, but the cost seems awfully high. It just makes it way too easy to accidentally wipe out your backup just when you most need it. Get briefly distracted or any number of things and poof.
User errors have a high likelihood of comming in bunches, perhaps because the user is tired, or perhaps because he is stressed from the first error, or whatever. It just happens a lot; I've seen it (and done it :-()) myself for other backup recovery scenarios with other software. The fingers got so trained to the usual backup command that they did it pretty much on their own when the backup tape was mounted to do a restore. Ouch. The unix tar command is horrible in that regard when used for backups (as has been done); one letter diference between the commands to restore from a backup versus make a backup (destroying the existing one).
I'm not sure what to suggest, particularly now after it is released (I wasn't watching here and didn't notice beforehand). I'd just like to add the caution that, for whatever reason, user error frequency is quite high when recovering from backups (any kind - not specific to SuperDuper), and I think one should be very sensitive to the possibility and to minimizing its likely damage.
I hope that at least there is an option to turn off this feature. Haven't downloaded 2.6 yet to look. I'm guessing that there is. If there isn't such an option, could you pretty-please add one (and maybe it ought to warn about the dangers that come with the convenience).
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