[ljosa]

I back up my private SSH keys by printing them as QR codes.

[Cthulhu_]

I liked the cryptocurrency wallet idea of writing down a set of 10 or so words on a piece of paper.

I mean that ultimately won't matter because cryptocurrencies are unusable when society collapses, but still.

[bogwog]

> cryptocurrencies are unusable when society collapses, but still.

Nah, I'm sure you could still scam a few people out of their rations with it.

[knallfrosch]

It would be enough to write any hex-looking string in monospace font on a paper, though. No need for it to be backed by a "real" wallet.