On Tue, Nov 04, 2003 at 04:40:55AM +0000, Karsten M. Self wrote: > on Tue, Nov 04, 2003 at 02:37:26PM +1030, David Purton (dcpurton@chariot.net.au) wrote: > > On Tue, Nov 04, 2003 at 02:57:04AM +0000, Karsten M. Self wrote: > > > > > If you need to recover a snapshot (or file) from 12 months ago, a > > > three-disk rotation isn't going to do much for you. > > > > We backup offsite on CD, so restoring files 12 months old can be > > covered that way. > > Did you back up to floppies in 1995? > > 1995 shipping hard disk size: 512 MiB > 1995 shipping floppy size: 1.4 MiB > Floppies required for a full system backup: 366 > > Current shipping hard disk size: 200 GiB > Current shipping CDROM capacity: 700 MiB > CDROMs required for a full system backup: 293 > > You could cover your needs with 1-2 large capacity tapes. > > Incremental backups would be even smaller. > > Note that CDR as arechival media for old projects is reasonably sane. > For system backups, it's idiotic. > This is what I mean - we do not need to be able to do a full system restore for files in the distant past. We publish maths textbooks and each book fits on one or two CDs, so once we have a book printed, we dump it onto CD and store copies in a couple of locations. So backups from our point of view only need to cover for what's currently being worked on. dc -- David Purton dcpurton@chariot.net.au If you, O LORD, kept a record of sins, O Lord, who could stand? Psalm 130:3
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