/Library/Server/Wiki/Database.xpg consuming huge amount (313GB!) of disk space
Solution 1:
I ended up completely uninstalling Apple Server to fix this problem. I used AppCleaner as it automatically gets rids of all the server files for you. A standard "drag to trash" uninstall would probably also work but I wanted to be thorough.
Not a very satisfactory solution to this, but it is better than nothing. If anyone else runs across this issue in the future, good luck with finding a better solution!
Solution 2:
I had same problem - several wiki backup files a minute. I found an article here (https://discussions.apple.com/thread/4597188?start=45&tstart=0), that solved the problem to me. The third party software GoodSync (GoodSync connect) caused the problem. I had to GoodSync > GodSync > edit gs-server install (without really installing) and delete /Library/LaunchDaemons/theGoodSyncOne.
Almost no more wiki which I don't use backups anymore!