It has optional, encrypted backups. With just a switch and a password, Duo Mobile will back up all your 2FA-protected accounts. So if you get a new phone, lose your old phone or delete the Duo Mobile app, you can pick up where you left off. And, unlike most other 2FA apps, Duo Mobile doesn’t ask you to provide any personal information or create an account to securely back up your accounts. Your backup is stored in your iCloud for iPhone and Google Drive for Android devices, so Duo Mobile never has access to your backup or decryption tools. It also can’t restore the backup for you if you lose or forget your password, so be sure to write it down.