I can only recommend to create a small .sh script with everything you do to install the system (and copy all your config files to the correct location, etc).

That way you only change your settings one, define it in your shell script (which you can have on github) and a reinstall will be fast and everything will be setup again.

Kind of like I did here: github.com/RononDex/dotfiles/blob/master/AstroPi-README.md

 

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