Ok, I see where you're coming from now, but what you're talking about isn't zfs 
send / receive.  If I'm interpreting correctly, you're talking about a couple 
of features, neither of which is in ZFS yet, and I'd need the input of more 
technical people to know if they are possible.

1.  The ability to restore individual files from a snapshot, in the same way an 
entire snapshot is restored - simply using the blocks that are already stored.

2.  The ability to store (and restore from) snapshots on external media.

Now I know a few people are working on the ZFS automatic backup stuff, and are 
currently looking at a way to automatically send snapshots to external media.  
I suspect these two features would work well with that if there were a way to 
make them possible.

However, being able to restore at a block level from an external device is 
almost certainly going to have a lot of gotchas at the technical level.  I 
couldn't say whether that would even be feasible I'm afraid, and to the best of 
my knowledge, neither of these features are present in ZFS yet.
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