Create transparencies with the text

   If you put at least 3 of these
   on top of each other, my Google
   recovery code will appear here:

   2  £ 3 > ]7   7#A    E

(each with different characters shown, of course. Ask a mathematician to make sure any 3 will show the full code, and any 2 won’t show enough to recover it)

Put them in envelopes, write “open in case John Doe dies” on them, and distribute them among friends.

If you distribute enough of them, I think there’s a reasonable chance they’ll recover your data.

As an improvement, distribute them not to your friends, but to their kids (the probability is higher they’ll be sane of mind when you die), and tell your attorney who has one.

I think that’s overkill, though. I’ve done it simpler: I wrote the full recovery codes down a few times and put them in a few places in my house.

I think that’s fine if I assume burglars won’t take them or won’t know what to do with them and I won’t die in a disaster that also destroys my house.