The short answer is no, except for the custom hooks that got blown away. All the settings and samba setup seem to be fine after I reinstalled. But I would highly encourage you to back up as much as possible since there is some risk. If you are going to try this I would say be careful removing Zentyal packages, specifically keeping dependencies in mind. So you should remove mailfilter before mail, etc. You probably want to "zs firewall stop" first thing as well.