Just to add: Keeping copies in a safe isn't as safe as most people would think. I've heard it often that "Well, it's a fire-proof, water-proof safe!"
Well, if your house burns down, it will keep the water the FD uses out, and there probably won't be much actual combustion (if any). But the heat alone can still be the end of a hard drive or CDs/DVDs. Fire-proof safes are called that simply because they're sealed enough to prevent the admission of more oxygen, one of the three ingredients needed for combustion. While there is oxygen inside a typical safe, there's usually not enough to sustain combustion if the temperature rises enough to start it. Given enough heat to provide the second ingredient of a fire, an ignition source, there will be combustion inside the safe. But it's won't last long even if the safe has gasoline inside of it... the oxygen will be depleted and the combustion will cease. But the heat is still present.
Your preferred storage method may not burn, but it can still melt. The longer the safe is heated up in a fire, the higher the internal temperature will become. You may get lucky and the fire is doused by the Brave Blue Crew, or the fire is in another part of the house and doesn't spread.
But rest assured, given enough time in a fire, your life-time of shooting, planning and post-processing will go bye-bye.
