On Tue, Nov 10, 2015 at 10:52 AM, Arun Khan <knura9 at gmail.com> wrote: > On Mon, Nov 9, 2015 at 9:31 PM, Alessandro Baggi > <alessandro.baggi at gmail.com> wrote: >> Hi list, >> how to perform a differential backup using rsync? >> >> On web there is a great confusion about diff backup concept when searched >> with rsync. >> >> Users says diff because it copy only differences. For me differential is >> backup from last full backup. >> > > You can use "newer" options of the find command and pass the file list > to rsync or scp to "backup" only those files that have changed since > the last run. You can keep a file like .lastbackup and timestamp it > (touch) at the start of the backup process. Next backup you compare > the current timestamp with the timestamp on this file. > Clarification -- for diffrential back ups, you should touch the file only when you do the *full* backup. -- Arun Khan