We've been using WSUS on Windows 2008 R2 for a long time. I setup WSUS on a new Windows 2012 R2 server and I checked the list of products I want it to download patches for. This is list does not include XP and Windows 2003, etc, that were downloaded onto our older WSUS server and I don't want those things brought down to the new WSUS server.
I know there is a migration method you can follow, but that requires that you copy over all the content and then copy over the database. I don't want to bring old junk over that isn't necessary and takes up space. What are the consequences of just pointing clients to the new WSUS server and not migrating everything over? Or is there a way to migrate settings over, but let the content download fresh from MS and only the newer stuff we need?