Hello jiajia2012,
As far as I know that after you backup one database to a path on your computer, you will get one .bak file for that database. And if you want to use data in that .bak file, you need to restore it in the SSMS. Right-click one Databases node in the SSMS and
select Restore Databases node. And in the From device field select the .bak file from your local machine.
And after you restore the .bak file, you should set up one TFS Application Tier to use that TFS database. You can refer to this blog for further information about how to configure TFS2010:
http://www.ewaldhofman.nl/post/2010/02/10/Configuring-TFS-2010.aspx
Thanks.
Vicky Song [MSFT]
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