I know how to pour a ground plane in eagle cad. My question concerns not the how, but the how much! I am laying out a shield for an Arduino Mega and my board contains traces and through hole pads and vias. It is a two sided board. I want to pour a ground plane on the bottom and would like to know if it is alright to pour the entire bottom or simply the least amount to catch all the ground connections. Is there some sort of rule-of-thumb or best-practice ideas for making this sort of decision?
Vic