MDM 7.1 - Migration Server

Hi friends!!

I have a SAP Netweaver MDM 7.1 installed on Windows 2003, we are going to change the server to Windows 2008, I don't know if the migration will be a new installation and then migrate the database, if this is the case, how is the correct procedure to migrate database, repositories? Do you have a useful guide?
I am new in MDM.

Thanks