Lists wrote: > On 07/02/2014 12:57 PM, m.roth at 5-cent.us wrote: >> I think the buzzword you want is dedup. > dedup works at the file level. Here we're talking about files that are > highly similar but not identical. I don't want to rewrite an entire file > that's 99% identical to the new file form, I just want to write a small > set of changes. I'd use ZFS to keep track of which blocks change over > time. > > I've been asking around, and it seems this capability doesn't exist > *anywhere*. I was under the impression from a few years ago that at least the then-commercial versions operated at the block level, *not* at the file level. rsync works at the file level, and dedup is supposed to be fancier. mark