[Zope] zope-Data.fs is growing with out adding content

Hi, I installed zope and zope site on an ISP.I had provided an interface for adding and managing content for the client with out going through ZMI. The problem is site is growing even with out adding any new content to the site.It is growing almost 30 mb per day with out adding content. zope version-2.3.3 pcgi Does any one has similar problem? Please guide me if you know any answers.Thanks for your help. regards, Dhanu