Etckeeper

etckeeper allows changes to /etc to be stored in a VCS repo

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.