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Isn't this exactly what Obnam does?



I suspect that Obnam doesn't cause all of the de-duplicated chunks to get so "entagled" (as bup puts it, in their readme).

There are existing discussions about the way bup pruning would have to work:

https://groups.google.com/forum/#!searchin/bup-list/prune/bu...

Sounds like they are actually making progress on it.




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