DVD changer/robot for backups?

I’m looking to improve my backup capability. I do event photography and I am looking for a way to backup 20-100 Gb of files without user intervention. I like DVD media, I just get (really) tired of hanging around to swap disks…

I was thinking that some kind of robot or changer would be “the ticket”, but I can only seem to find information about “industrial strength” ones (with “industrial strength” prices), or ones that seem aimed only at media centers.

I’m not adverse to some DIY or integration. I have a decent background in hardware and stuff, but I’m not interested in reinventing the wheel either…

Any suggestions, pointers, references…?

Cheers,

Geoff S.