If you are planning to replace your mobile device or just want to be prepared for that occasion while using Google Authenticator for two-factor authentication (2FA), please read the following:
In the past, simply uninstalling and reinstalling Google Authenticator on the same device would cause you to lose all your accounts because the secret keys were stored only locally and wiped with the app data.
However, Google Authenticator now offers a critical option to back up your accounts to your Google Account using cloud sync.
Key Takeaway for Account Restoration
- If you have cloud backup enabled (the recommended method): Your accounts should be restored when you sign in to your Google Account within the reinstalled Authenticator app. Look for a green cloud icon in the app, which indicates the backup is active. Cloud backup also allows use of multiple devices, like a mobile phone and/or a tablet together, which equates to an easily accessed backup of your accounts.
- If you do not have cloud backup enabled (the older method): Uninstalling the app will likely delete all the secret keys for your accounts. You will have to manually re-setup every single account using the original QR codes or setup keys you saved, or by using your backup codes/account recovery process for each service.
What You Should Do Before Switching Devices
To be safe, always confirm your accounts are backed up or have a recovery plan before you lose access to your current phone:
- Check for Cloud Sync: Open the Google Authenticator app and look for a cloud icon near your profile/Google Account at the top. A green icon usually means your codes are backed up to your Google account.
- Use the Export Feature (The Manual Backup): You can use the "Transfer accounts" or "Export accounts" feature to generate a QR code containing all your secrets. Take a photo or screenshot of this QR code with a different device (or print it out) and store it in a secure location. You can then scan this saved image with the reinstalled app on your new device using the "Import accounts" feature.
- Ensure You Have Backup Codes: Confirm you have securely stored the one-time backup codes provided when you initially set up 2FA for services like Google, Facebook, Amazon, etc. These codes are the ultimate recovery method if you are locked out of the Authenticator app entirely.