I set up a backend-only CMS for a client using pyrocms, which is a lot more simple and bullet-proof to build and maintain than a full blown wordpress/joomla-stylee CMS (ugh). At least it was a couple of years ago (haven't looked at it since).
The live site loads editable stuff (very limited, a few text blocks on a couple of pages) from the same mysql db tables.
EDITED: 15 Sep 2013 21:26 by DSMITHHFX