[Zope] How to restore Data.fs?

Dear List, I have a back up of Data.fs file. I took that from my server and want to put that in my machine. I newly installed my Zope server. Copied the Data.fs into /var/zope/var/ and restart the zope server but not able to access logged into the Zope management interface. I used the previously used user name and password (same as in the server) to access. But not able to access. Please let me know where I have gone wrong? -- Regards Praveen Kumar, SoftPro Systems Ltd, Ph: 91-40-23111806 23111806