Using developer source code revision control tools to keep your server secure
The largest fear of any server admin is a breach. No matter how cautious you are, it can happen. (e.g. 0 day exploit)
One of the ways you can help protect your server is by making sure you keep critical files under version control systems like Git or Subversion (SVN). Then you can monitor for any file system changes, any remote access trojans inserted, etc.. Of course, limitations apply if the server is fully compromised, rootkit style.
After all, these days, a web site *is* indeed a code base.
We at Bitsum do everything we can to keep what limited data we store (basically your name and contact info) secure.