You can upgrade TeamForge on new hardware, or you can stick with the same server your current site is running on. To choose, consider how your members use your site and how you maintain it.
Upgrading on new hardware is a little more complex, but provides more flexibility.
Do it this way if you want to:
If you are OK with your current hardware setup and you don't want to rock the boat, you can run your new TeamForge site on the same box where your current site is running.
Do this if you want to: