etckeeper is a collection of tools to let /etc be stored in a git,
mercurial, bazaar or darcs repository. This lets you use git to review or
revert changes that were made to /etc. Or even push the repository
elsewhere for backups or cherry-picking configuration changes.
It hooks into package managers like apt to automatically commit changes
made to /etc during package upgrades. It tracks file metadata that git does
not normally support, but that is important for /etc, such as the
permissions of /etc/shadow.
It's quite modular and configurable, while also being simple to use if you understand the basics of working with version control.
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