Not really, no. It's very difficult to determine move vs. delete-and-copy. To do so you'd have to checksum every file on the drive, every file on the source, and then try to match things up. It'll take longer than it does to just copy...

If you delete the old copy, and the new copy is damaged, you'll still have the original.

(In the normal case, as soon as you've done the smart update you don't have the old copy, you've copied the new copy, and you still have the original.)

So I don't really see that you gain much by avoiding deleting the file on the destination until the last possible moment - at most you reduce the opportunity for data loss of the original by about an hour, i.e. the time it takes to run SuperDuper!

No, because the new copy couldn't be copied because the original was damaged.