Two-factor authentication app that does something Google Authenticator still refuses to do properly - cloud backups. If your phone breaks, drowns, or gets stolen, you don't lose access to 47 accounts. Multi-device sync means you can have your 2FA codes on your phone and tablet simultaneously. Yes, cloud backup introduces a theoretical attack vector, but the practical risk of losing your phone and being locked out of everything is way higher. Use this or at least export your Google Authenticator codes somewhere.