Hi,
Update timestamp on server & initiate the replication.
Batch file will be available at the following locaiton:
C:\Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\Tools\updatetime.bat
I do agree with Sumit G as well, if there is no plan for expansion in the future.
It will be easy to manage clients using GUP.
However if you need additional SEPM then go ahead with Replication.