First, turn on two-factor authentication for the account. You'll get a QR code or setup key. Next, open the Google Authenticator app and tap the plus sign. Record the 2FA code/key. Whenever you're ...

(Yes, you can only do 10 at a time.) Tap on Export once you’ve made your choice. Launch Google Authenticator on your new iPhone and use it to scan the QR code on your old iPhone.

You can move Google Authenticator to a new phone so that your new device can gain an additional level of security through two-step authentication.

Google Authenticator now syncs one-time codes with your account, so you're not stuck if you lose your device.

Google has updated its Authenticator smartphone app for Android and iOS with support for backing up two-factor authentication (2FA) codes to the cloud.

Google isn’t the only firm offering 2FA sign-in codes to provide backups. Since 2019, Microsoft has allowed people to use a “backup and restore” tool for its Microsoft Authenticator app.