3 ms·

To answer my own question: deduplication :) I had not considered multiple backup sources, mine is deduplicated per host, am I to understand tarsnap is deduplic

• beagle3 13y ago
  I think that's the case. Note: https://github.com/bup/bup https://github.com/bup/bup does that too (though it does not encrypt), and http://liw.fi/obnam/ http://liw.fi/obnam/ does too (and it does encrypt). What tarsnap gives you that obnam doesn't is (a) managed cloud storage, (b) tarsnap's history and reputation, and (c) Colin's personal reputation. That's a lot, and it costs money above the S3 storage costs (which you could point obnam at).
• vbit 13y ago
  Also, easier restore and snapshot deletion. Consider how you would restore using incremental ZFS snapshots. You'd have to pull all the snaphots, unpack the base snapshot and then sequentially unpack each incremental snapshot. In tarsnap, the server will compute the 'snapshot' you want for you, and will only send you the data blocks that belong to that snapshot. In tarsnap, you can also delete any snapshot you want, and only blocks belonging exclusively to that snapshot will be deleted. In your system, deleting a snapshot means you lose all snapshots from that one until the next full snapshot. Also, in ZFS you're limited to backing up complete datasets, but with tarsnap you can backup any set of files you want.