You can refer to the epo 4.5 disaster recovery KB66616 if you plan to retain the same name for your production ePO server. If the name is changed then refer to KB66620.
Thats not what we ended up doing, but im sure it would have worked. We eneded up just wiping and reloading from scatch and deploying all new agents. In hind-site i should have removed all the agents from the old server first. Now i think i have some issues with sitelist.xml's and i would like to have throught that would have fixed it.