Hi Ajay,
About the Groups, what best you can do is take a screenshot of the Clients page with all the groups shown and then you will have to create them manually.
As said above Policies can be exported but Groups cannot.
You can also install a new SEPM with Failover option to the old SEPM, this will give you all the groups and policies without exporting.
Check the following articles
Title: How to export/import an existing Symantec Endpoint Protection policy
Web URL: http://www.symantec.com/business/support/index?page=content&id=TECH106486&locale=en_US
Title: How do I move Symantec Endpoint Protection Manager from one server to another with a different IP address and host name?
Web URL: http://www.symantec.com/business/support/index?page=content&id=TECH104389&locale=en_US