To continue the discussion about backing up: I recently had to decide how best to archive some old dance videos that have just been converted from VHS to DVD. I've gone for redundancy and diversity.

For each video I have made one copy on an "archival quality" DVD-R, one copy on an "archival quality" DVD+R of a different brand and, for good measure, a .iso DVD image on a hard drive.

This article argues that DVD+R is inherently better than DVD-R, but I decided I might as well use both.

Richard