If your question is "Can I have a home computer joined to two Windows Home Server machines at the same time?" then the answer is no. A client computer can only be joined to a single server. You can switch between your servers on a client computer by running
C:\Program Files\Windows Home Server\Discovery.exe , which is the tool that the connector uses to connect initially to a server, but that will switch all Windows Home Server functions (including backups) to the new server.
There's a suggestion on Connect
here to allow some sort of multi-server connection. You may want to take a look, and vote if you agree that this is a feature the product should have.
I'm not on the WHS team, I just post a lot. :)