Not exactly sure how to do what you're recommending -- are you suggesting I go 
ahead with using rsync to bring in each snapshot, but to bring it into to a 
clone of the old set of snapshots?  Is there another way to bring my recent 
stuff in to the clone?

If so, then as for the storage savings, I learned a long time ago that rsync 
--inplace --no-whole-file has the same effect - it makes sure to only touch 
blocks that changed, so in theory I ought to be able to rsync over my snapshots 
intelligently without wasting any more space than they took up to begin with.

Not sure if that's what you meant.

Thanks!
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