Would this also work for SuperDuper smart duplication? I use TimeMachine for the incremental backups (to a Time Capsule), and SuperDuper for disk duplication to an external disk. This way, when my hard disk crashes, I can just boot from the extrernal (SuperDuperCopied) disk and continue business as usual. SuperDuper has an option where it uses 'Smart Update' to update the copy, only updating the files that have changed.
So I was wondering, does SuperDuper recognize the Sparse Image Bundle as a collection of smaller files, or will it rewrite the comple Sparse Image?

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I use the above method to create a sparseimage for my parallels virtual machine on the Mac. When I use SuperDuper to make a (readonly) disk image of my harddisk as backup, it copies both the sparseimage and the contents of the mounted image. This results in a backup that is bigger than the original disk, and cannot be restored. My advice here: you can use SuperDuper, but either:

make sure you unmount the sparseimage before making a disk image as backup, or

exclude the contents of the mounted image from the backup, or

at least check the size of the resulting backup and remove the duplicated content of the sparseimage after the backup if the size is a problem (not the sparseimage itself).

I assume the same problem could occur with time machine, if you forget to exclude the mountpoint.

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