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by derekp7 2955 days ago
The trick with Google's 2FA is to keep a copy of the setup code and/or QR picture somewhere -- preferably printed and in your fire safe.

Personally I've also got it floating around one of my Linux devices with a small program I can run against it to display the codes, which came in handy when I switched phones and forgot to reload the GA app. (Yes, I know that this defeats some of the security of the second factor, with it supposedly being "something you have" that can't be easily reproduced).