backup, then restore to older version of sql server

I have a database on a sql server 2008 R2 ( Nov CTP ). I want to copy ( backup/restore ) a database to a prior version of sql server on a Vista PC. Version 10.50.1352 to 10.00.2531.  I am getting an error on the restore saying I can't restore to an older version of sql server.

How can I copy the database? 

thanks,