I think Microsoft Authenticator is internet based. The 2FA secret key is backed up to their servers. Aegis is open source, free and has backup and restore func

I think Microsoft Authenticator is internet based. The 2FA secret key is backed up to their servers. Aegis is open source, free and has backup and restore functionality. It also has a great UI and custom icon support. Under active development - http://github.com/beemdevelopment/aegis http://github.com/beemdevelopment/aegis