> > Perhaps there is a file system that supports compression and would do a > good job with the snapshots transparently. Maybe even ZFS or btrfs do? > Hi, I agree with Lee. Btrfs actually does sport built-in compression as a mount argument/flag and the delta snapshots works beautifully well but I wouldn't dare to use it with any kernel previous to 3.13; in fact best practice would be to use it with kernel 3.14.x or later, preferably 3.15.x and later. B.R.