https://passwordbits.com/how-to-back-up-the-google-authenticator-app
Long story short, you would tell the Google Authenticator app to export the various accounts managed by it. The process will create one or more QR codes, depending on how many 2FA accounts you try to export. Each QR code encompasses up to ten 2FA accounts, meaning if you have 11 accounts, the process will create two QR codes. The resulting QR codes look more "dense" than a typical QR code. I suspect these QR codes have more complex information. You will scan these QR codes to recreate the 2FA accounts on a different smart phone such as your new replacement phone.
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