SEP 12.1.3 install and GUP

Hi,

We have 2 site

SEP 12.1.3 to be installed at Site A  (Windows Svr 2008 Standard r2- with 100 clients

Site B - with 50 clients on a separate subnet. Site A & B are connected via a leased line connection.

Whats the best way to push updates and policy to to Site B? Install a secondary server or use GUP ?

Thanks