After installing your OS (Manjaro in my case) and configuring it to your likings, which directories do you backup? (or reverse-question, which directories do you not backup?)
You should not do that. Things can break. Your user configurations are stored in .config and Your System configurations stored in /etc/ are used by your system. I wouldn't recommend it.
Programs may read from /etc, but it's not recommended. Instead, I recommend having your .config directory stored somewhere, or preferably, have all configs in a git repository (often called dotfiles) and deploy them on systems for example with stow