Aside from my regular backups on Blu-ray (unencrypted), I've got two hard disks that hold the same data (and will be updated infrequently, once a year at most).

This is my disaster fallback: house burning down, me awakening from a coma without remembering any passwords or whatever.

Those hard disks are stored in the houses of two friends. And they are encrypted (BTW, that's not only for my peace of mind, but also for theirs: I wouldn't be comfortable holding personal information of my friends unencrypted).

The password to the encryption is split into n parts, such that very close family and friends get more parts and more remote friends get fewer parts. But noone can recover it without cooperation of at least one other.

Printed onto a sheet of paper, together with a clear description (including actual command line invocations) how those shares were generated and how they can be combined). Distributed to a lot of friends. That description is important and must be abundantly clear. Not necessarily to your grandma, but if she shows it to someone who knows at least a bit about computers, he must be able to make sense of it.