The thing I haven't figured out (mostly because I haven't sat down and done so) is how I'd access mail and such—without my password manager on my own phone, I don't have access to anything.
I've sat down and tried to figure this out, and never been happy with the solution. I carry an old phone as a spare, which also has my password manager and 2 factor codes.
I asked HN about this recently because I couldn't believe everyone, especially people who aren't interested in designing backups, i.e. the type to come to HN, were all thinking this through enough to have good solutions.
HN consensus seemed to be for hardware keys like Yubikey, and paper backup codes.
