[mmebane]

You print off a list of backup codes and stick them in a safe. Then log in with the backup code, and set up a new Authenticator token.

You could also add a U2F token and store that away.

[rglullis]

Not all of the services that implement Google's 2FA provide backup codes. Plus, the idea is that 2FA should be used anywhere, even for lesser-values web sites, so the idea of printing everything seems to be archaic.

[feld]

Or save the token in an encrypted password manager so you can retrieve it later