Like most others, I don't use a footprint; never have. I will sometimes carry it (mostly in mud or snow), but end up using it for other things: flooring in the vestibule, something to sit on at breaks or in camp, and (fair weather and no bugs permitting) leave the tent body at home and use it with the poles and fly only to create a tarp like shelter.

I've used the Copper Spur, about 3 years ago, and never used a ground cloth. Camped in the forest, and never had a problem with abrasion or sharp sticks or rocks.