I've seen some pics of people using quick hoops and they attach them on the top with wood so the plastic stays taut when snow, rain or wind comes along. I'm wondering if that would help mitigate snow damage, although I realize that this year's heavy snowfall might collapse the hoops no matter what you do. Also, do you use those plastic PVC clamps that go onto the hoops?

Oh bummer...sorry.... looks like you will be having to order more cloth, or plastic, whatever you had covering them. Thats discouraging. you have had unprecedented snowfall... hopefully not a trend,just a fluke.