OMG this is awesome. I have 30 yards in my back yard as well but my wife will not let me shoot back there.. She says one day I am going to trip while I am at full draw and shoot someone. I tried to tell her I do't walk while I shoot hahahaha I also don't draw with my bow facing up in the air.. I only draw while at the target. and I have two 4 foot x 8 foot 1/2 plywood boards back to back as back stops so 1" thick total, and my wooden fence. If the arrow makes it through all of that it would be just barley.
Sometimes I sneak out in the backyard while she is not home and set everything up and shoot. Then take it all down byt the time she gets home.. Like a scared little kid sneaking candy! But I would not be without her hehe