Aegis [0] is a much better alternative to Authy if having backups is a must (and even if it isn't too), specially because you will be in control of these backups. If you are on iOS Raivo [1] is a similar alternative that provides encrypted backups to iCloud.

[0]: https://github.com/beemdevelopment/Aegis

[1]: https://github.com/raivo-otp/ios-application