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https://etckeeper.branchable.com/

https://docs.github.com/en/get-started/getting-started-with-git/managing-remote-repositories?platform=linux

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent

https://serverfault.com/questions/411494/etckeeper-on-custom-directory#411512

sudo apt-get install etckeeper
sudo etckeeper init
cd /etc
sudo git status
sudo git commit -m "initial commit"
sudo git gc # pack git repo to save a lot of space