We have a backup DC currently running Windows Server 2003R2 and WSUS 3.0 SP2.
The OS is installed in a 40Gb partition, and the WSUS folder is on a totally separate partition.
We want to upgrade to Windows Server 2008R2, by overwriting the Windows Server 2003R2 in the 40Gb partition.
After the upgrade we want to restore the WSUS installation.
What we plan to do is to demote the server to a member server.
Install Windows Server 2008R2 in the 40 Gb partition.
Promote the server to a DC.
Install the WSUS role, and choose to use the original Update Source (WSUS folder)
and select "existing database server on this computer".
Will this work or are there other steps we should take?