Gold is an investment that withstood test of time but storage wise is a real concern. Are we supposed to keep it in a safe at home or rent a vault with the bank? These are additional upkeeps and concerns.
For bitcoins, we just need a 10 buck thumbdrive!
Oh, s**t! Where did I put that thumbdrive?!

Perhaps, one live copy in thumbdrive, and the private keys to addresses are burnt to an optical disk (such as DVD) and stored in a camera dry box. The private keys should also be printed out and sealed in an air tight bad and kept it together with your will.