How do I backup configuration entered via the addons UI?

I’m getting started with Home Assistant (using hassio for now), having previously used Domoticz for many years. As I come from an IT background, I have set up the config folder to be a git repository and use github and travis to manage and check changes before they get applied. However, this only applies to changes entered in the various .yaml files.

How do I apply configuration management practices to the various configs applied to addons through the hassio UI?

Nobody? Surely, somebody can answer this.