VersionPress Brings the Power of Git to WordPress

One of the best things about WordPress is how easy it is to make sweeping changes to a website in just a few minutes. But with no easy way to revert a website to a previous state, you can lose a lot of work very quickly if you aren’t careful. VersionPress brings the power of Git to WordPress so you can make as many changes as your want with the knowledge that undoing any change is just a click away.

Source: Setting Up VersionPress for Git-Powered WordPress Version Control – WPMU DEV

Appears to work for both content and backend changes which would be handy. Not sure how it would work on large multisite installs like Classcaster or Lawbooks.