When you deploy the PST Agents to your computers, you will need to supply the hostname of the PST Central Service.
We recommend that you create a DNS CNAME (or "Alias") record and use this rather than the absolute hostname of the server running the Central Service. If you later choose to move the Central Service to a different server, you can change the CNAME record to point to the new server.
If you do not use a CNAME, you will need to uninstall and redeploy all PST Agents.
For more information on creating a CNAME record using the Microsoft Windows DNS Server, see Add an Alias (CNAME) Resource Record to a Zone on MSDN.