Groupwise 2012 on a Windows server - single domain and 4 Post Offices, GWIA and WebAccess

We are going to move one post office to new hardware, freeing up disk space. The PO is about 20GB (25 users). Our thought is to use DBCOPY for the first pass, copying the PO folder to another server. Then, when the PO service is shut down, use ROBOCOPY to /MIR to the new server. Finally, install the Groupwise Agent on the (new) server and update the Link configuration for the domain. Do we need to rebuild the domain DB? Thoughts? Suggestions?