Yeah I've thought of getting one of those fire safes but I'm sure it still gets quite hot in there, not sure if electronics can handle that. I would just put the backup drives in there. I assume they're water proof too so it would save from flood, and if I ground it, it would probably save from small scale EMP (like a neighborhood transformer explosion or something). Now that I think of it, may be a better idea. I could even store it in the shed, though not sure if a HDD can survive well at -50C. I've heard of people putting them in the freezer, but think it only gets like -10 in there.