On Mon, 16 Jul 2007, Afinat wrote: > I know that there is a lot of strategics... But which one you recomend?
How many tapes do you have, how much data are you backing up each day and what is the speed of your media? My strategy on our older single-tape systems(*) tends to be a full backup on Tuesday nights, tape change on wednesday and incrementals through the week, culminating in that full backup. Tapes are marked with the date they're inserted and (especially important for DAT/DDS) how many insertions they have had. We usually only keep DATs for 20 cycles due to reliability concerns. Tape changes on Monday or Friday are generally a bad idea - long weekends wipe them out, which is why the fullbackup window is really only available on Monday-Wednesday nights. Problems start when multiple tape changes are required during the week. At some point it's worthwhile getting a small silo or other form of changer. Given a fast enough connection there is no need for the backup media/server to be in the same location as the filesystems being backed up - and several good reasons why they shouldn't be... For small backup systems and non-archival purposes, I'd be inclined to use removable sata disk units in removeable enclosures such as rhinocase devices instead of DDS/DAT. They're much better bang/buck than anything smaller than LTO2 as long as they are properly looked after and constantly monitored (smartd is your friend). Just remember there are tiny moving parts inside them which don't like being knocked around... * I would prefer to replace them with Bacula clients, but politics, "ownership" and "control" get in the way. I suspect a lot of academic sites have similar troubles. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
