On Wed, Jul 28, 2021 at 10:16:19AM -0600, Charles Curley wrote: > On Wed, 28 Jul 2021 11:04:59 -0400 > Dan Ritter <dsr@randomstring.org> wrote: > > > However, if you don't need second-by-second simultaneity, you > > could just set up a cron job to rsync your first drive to your > > second drive once an hour or twice a day or overnight. > > Or use rsnapshot to get the same effect with less effort. RAID and rsync/rsnapshot have different profiles (although they share, of course, some traits). The first is about availability: if one of your disks die, you can just go on as if nothing happened. Take it out (as far as your hardware supports hot swap ;-) , pop a fresh one in and let the RAID fairy restore redundancy. With the second, if what dies is your backup, all fine. If it's your primary disk, you'll find yourself scuttling to set up a new system and get the data in. OTOH, with the second, you can set up things to stash away several snapshots of your system. If you fat-finger your valuable data away, you just can page back in your snapshot history until you find good data (attention Windows users, with all that ransomware which seems to be fashionable with you ;-) Rsync provides ways to store snapshots in a reasonably storage-friendly way (option --link-dest). Rsnapshot (which, AFAIK is based on rsync) makes this a bit easier. In a nutshell: what old sysadmins always say: RAID and backup are different things. You want the first if you need high availability, you want the second if your data is valuable. > Does anybody read signatures any more? I /never/ do. Cheers - t
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