We had one break at the nipple. The rest all broke at the hub. Our LBS tech noted that disc brakes inherently put more stress on the spokes than rim brakes do and that spoke breakage at the hub would be expected. It makes sense as you are slowing the wheel from the hub rather than the outer circumference of the rim. If your frame is set up like ours you should have mounts for a typical rim brake in the rear. That might be an option for additional braking power without overstressing the spokes.