On 11/09/2015 09:59 AM, John R Pierce wrote: > On 11/9/2015 9:50 AM, Gordon Messmer wrote: >> I don't see the distinction you're making. > > a incremental backup copies everything since the last incremental > a differential copies everything since the last full. I guess that makes sense, but in backup systems based on rsync and hard links (such as rsnapshot), *every* backup on the backup volume is a "full" backup, so incremental and differential are the same thing. > rsync is NOT a backup system, its just a incremental file copy ..which can be used as a component of a backup system, such as rsnapshot or backuppc.