The worst fear of any server maintainer is a breach, and not through any negligence or fault of their own. 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.
Still, this is an important safeguard and I’m not sure many server admins are aware of it (since they aren’t primarily developers).
We at Bitsum do everything we can to keep what limited data we store (basically your name and contact info) secure.