On Monday, November 09, 2015 09:50:52 AM Gordon Messmer wrote: > > How I can perform a diff backup? > > Save yourself a lot of trouble and use a front-end like rsnapshot or > backuppc. If I may, I'd like to put in a plug for ZFS: Combining rsync and ZFS, you can rsync, then make a ZFS snapshot, which gives you the best of both worlds: 1) No messy filesystem with multiple directories full of hardlinks to manage. 2) Immutable backups. 3) Crazy efficient storage space, including built-in compression. Much more efficient than rsync + hard links. 4) Ability to send the entire filesystem (binary perfect) to another system. 5) Ability to upgrade and add storage space without taking it offline. 6) Ability to "restore" a snapshot to read/write status in seconds with a clone that you can throw away later just as easily. 7) Or you can skip rsync, do the snapshots on the source server, and replicate the snapshots with send/receive. 8) Uses inexpensive, commodity hardware. ... and on and on.... We've moved *all* our backups to ZFS, the benefits are just too many. I'd like to plug BTRFS in a similar vein, but it's "not yet production ready" and it's been that way for a long, long time... Ben S