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Google Authenticator is backed up on iOS if you use an encrypted local backup via iTunes (or macOS Catalina) or iMazing.

• pmoleri 7y ago
  Mmm, does that mean that now your iCloud password unlocks all your 2FAs? It isn't that bad, it still a 2nd factor, but it's worth considering it.
  • nojvek 7y ago
    When you make an encrypted backup, you enter a separate passcode. So it’s not your iCloud password.