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Re:OnlyKey: Open-Source Alternative to YubiKey by dbrgn on Friday December 27, 2019 @04:40AM (#21890242)
Google Authenticator implements TOTP, which is actually a very simple standard: https://pthree.org/2014/04/15/time-based-one-time-passwords-...

If you can extract the private key, you can transfer it to another phone or device.

On Android, AndOTP is open source (available on F-Droid) and allows encrypted backups. As for Google Authenticator, I don't think you can create backups.

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