[Zope] help :( ... entire site disappeared

I reinstalled Zope2, having saved my var directory to another location. I shut down zope properly before saving that directory. Now, when I put the files from the old 'var' into the new 'var', the new Zope2 doesn't see them and just gives the default view with acl_users, control panel, and standard_*. Have I lost everything? What happened? Why doesn't it recognize my Data.bbb?