John,
FWIW, fireproof safes are rated for their ability to protect paper, not computer storage media. I have seen additional inserts that go into a fireproof safe drawer. They basically provide more insulation to protect the media from melting.
>It then goes into a fireproof safe. What would happen if you had a fire and you had backed up to another disk, to tape and even to a jaz drive and the fire got all of them. You might even want to look at getting an off site location just for that, or purchase a fire proof safe.