Etckeeper – let /etc. be stored in a Git, mercurial, bazaar or darcs repository

One big advantage of this is how easy is it to use. Once you install a fresh Ubuntu system, just install the package:

     sudo apt install git etckeeper

and you are done! postinst script will create /etc/.git, set up sane exclusions, add existing files, commit. In most cases, no action is needed -- the changes are commited before and after package install, as well every night.

This is like the ideal backup system -- trivial install, no user interaction, and uses standard tools to view backups.