You can initiate a synch manually following the instructions in this tutorial. Once you have setup the synch parameters, then in the future when you want to synch the grid it’s only a couple of clicks, so you don’t have to add each computer manually. And yes the synch can include multiple OUs.
There is not currently a way to schedule a synch, though we are considering this for a future build.
BatchPatch cannot distinguish between the types of computers in a particular OU, so if you want to synch your servers without synching your clients, then you would have to keep the servers and clients in separate OUs.
-Doug