I specifically have multiple phones setup with my Google Authenticator account for this reason. If you don't have a spare phone, I recommend purchasing a used old android phone for $30 just for the peace of mind.

1Password on a laptop can hold google auth keys

Just curious - what's wrong with backup codes?

If you are really paranoid. Backup codes can be copied without you noticing. Even bigger risk if you bring them along while traveling, or worse, leave unattended in hotel room.

The Authenticator apps store keys in Secure Enclave (or at least I hope so). Which in themselves are 2fa by not being copyable thus requiring direct access to unlocked phone before using.

Of course that also comes with bigger risk of you locking yourself out, by forgetting Lock Screen password or phone getting bricked for some stupid reason. Printed paper don’t have that problem, except can also easily be lost.

Here's my solution: https://github.com/evanpurkhiser/recovery

Similar: https://github.com/sowbug/quaid

My 2FA is all using Yubico Authenticator, so even TOTP codes are on my Yubikey rather than my phone. I keep my backup codes in 1Password in case I lose my keychain.

There's a reason 2FA always gives you backup codes? If you didn't write them down that's on you.

I guess you'd write an "Ask HN" post and hope that a Google engineer notices. Same for GitHub.

You know those backup codes they make you say you've printed before you can complete setup?

Maintain a second device (doesn’t have to be a phone) with your 2FA codes.

In a sense, humans already have to be cyborgs to function in modern society.