https://www.bleepingcomputer.com/news/google/google-authenticator-now-backs-up-your-2fa-codes-to-the-cloud/

The Google Authenticator app has received a critical update for Android and iOS that allows users to back up their two-factor authentication one-time passwords (OTPs) to their Google Accounts and have multi-device support.

Two-factor authentication (2FA) adds a second layer of security to your online accounts, making it more difficult for attackers to hack them. Accounts configured with 2FA will require users to enter a one-time passcode before logging into an account, which is sent via SMS texts, emails, or generated by an authenticator app.