E4 member’s guide:
www.elitefourum.com/t/safes-101-an-introduction-to-protecting-your-collection/20784/1
www.elitefourum.com/t/safes-202-data-media-safes-and-what-they-accomplish/20872/1
Something like this would be my recommendation:
www.nationwidesafes.com/strong-fire-resistant-safe-1935.html#description