# Install svk for /etc version control
apt-get install svk
# Initialize a depot in /root/.svk
svk depotmap --init
# Import /etc making it a working copy
svk import --to-checkout -m"initial" //etc /etc
# Make your depot not that readable
chmod -R go-rwx ~/.svk
# Remove volatile files from revision control
cd /etc
svk rm -K adjtime ld.so.cache
svk ci -m"no volatile files"

s.a. http://mediawiki.softmotion.de/index.php/Etc_unter_Versionskontrolle