According to this article from MSDN. Yes you can use that method.

http://msdn.microsoft.com/en-us/library/ms189625.aspx

From: Ehren Benson [mailto:[log in to unmask]]
Sent: Wednesday, April 13, 2011 10:27 AM
To: [log in to unmask]
Subject: [MSUNAG] mssql detatch

Hi,

I want to detach a MSSQL 2000 database and then attach it to a 2008R2 server on a DIFFERENT box.  (I’ve read that it will automatically upgrade the database when you do this).  If I detatch it from the source box, copy the files to the new box and attach the copy is it possible to then re-attach the original to the original server as well?

Basically I want to move this database to a new server but have it online to test for a few days before it goes live, but I want the original to still be available in the meantime.

I’m not a big database guy so I’m tryin to figure this out ;)

Thanks!

Ehren J. Benson, MCSE

Windows Systems Administrator

Department of Physics and Astronomy

Michigan State University

1209 A Biomed Phys Sci

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517-884-5469