Like most people, I had got use the reliability of modern disk systems, to the point of stopping backups to CD and DVD and relying on SATA RAID.
I would personally now use either tape or DVD RW for incremental backups perhaps running overnight. Tape would be faster than DVD. Remember you don't expect to recover data on a daily basis.
Hope this helps
Jim
I also have a Raid mirroring system but in addition use a Maxtor External (USB or firewire) hard drive that can do incremental or complete back up of my hard drives. In addition, Any key image files are also backed up on two CDs (kept in different locations).
Ken Weissblum
www.metaphotography.com
fine art photographic imaging: nudes & landscapes
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