A backup saves the data from yesterday and earlier if your filesystem gets corrupted, or you type rm -rf * in the wrong place, or you overwrite your doctoral thesis with a thank you note to your grandmother, or if multiple drives in the same RAID array croak before you can get it rebuilt. It can't recover data that was written since the last backup.
RAID saves you from losing today's data if one of your drives croaks. It can't recover data that was not the result of a hardware failure. If you do regular backups, and if there is a class of data for which you can tolerate losing a day's worth of work, then you can get away without RAID for that data. Although a backup can be used to recover your non-RAID boot & root filesystems if the hard drive they are on fails, you need to have or create a bootable disk or CD to run the restore from. With RAID, you just boot from the remaining good drives and have a running system while the RAID is rebuilt onto the new drive. -- John Stimson ------------------------------------------------------------------------ John Stimson's Profile: http://forums.slimdevices.com/member.php?userid=218 View this thread: http://forums.slimdevices.com/showthread.php?t=84125 _______________________________________________ unix mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/unix
