[Zope] cvs or rcs and zope

I've finally reached the point where the site code base is large enough that weve managed to create a version problem. <sigh> It's time to put the whole thing under source code verison control. I don't see the best way to do this in the Zope enviroment, at least not transparently. (For example, downloading with FTP and uploading is not invarient.) What's the preferred approach?