If all you need is your shares, running the server backup from the Computers and Backup tab is all you needed to do.
But there's really no need to do anything. Shut your server down until you have the software, then once you've received it use it to perform a server recovery. You are required to do that in any case, as the evaluation software contains a time bomb which will disable it even if you enter a product key. See
this FAQ for more information.
I'm not on the WHS team, I just post a lot. :)