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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