A couple of stories about how the "big shops" deal with it (or not)

http://www.laweekly.com/music/master-recordings-from-abbey-road-to-born-to-run-could-be-lost-forever-without-archivists-help-7575450

http://mentalfloss.com/uk/entertainment/27204/how-one-line-of-text-nearly-killed-toy-story-2

Remember to store at least one back up copy at another secure location to protect yourself from fire/flood/theft &c.

One can buy a +500gb micro-sd card for under U$60. One card holds a lifetime of scanned documents. My entire music collection, tax records, photos &c fits in a standard business envelope in the safety deposit box.