Bad things! rsync isn't smart enough (AFAIK) to know that files have been renamed or moved: it just sees files disappearing on one side and appearing on the other side, so the daily delta can get big.
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Yeah that sucks…
I'm looking into using the incremental diff/snapshot feature of btrfs to implement a more efficient solution :P
DRBD may be a good solution to this problem, although I haven't spent the time to see what it would take to replicate over ssh, and the kind of traffic that is incurred vs changes in origin.
https://en.wikipedia.org/wiki/Distributed_Replicated_Block_D...
Interesting! Never heard of this before.