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I know that you originally posted about garage-like temperatures and longevity of stored items, but remember, in a house fire, Safe = Oven. You might want to think about the mixed usage you describe with regards to fire protection....

Depending on the rating the safe interior can reach 350 degrees in a half hour....This is OK for paper, metal , wood, etc...Keep in mind that photos, DVD's, cellophane envelope windows, and other plastic items (many papers are also plastic coated), etc begin to deteriorate at a much lower temperature. Additionally, the items that do deteriorate can produce smoke/gases that may damage, discolor, or corrode items that otherwise may have been ok with the temperature alone....