Todays first snow here on the Southern Shore in Connecticut reminded me to put out my annual reminder. When shoveling snow off your wood or composite/PVC deck, always use a plastic snow shovel. No metal tip, all plastic. The metal shovels or shovels with metal grommets holding an edge stiffener can also do a number scratching the surface. So if you are one to shovel your deck, porch, front porch, stairs etc. Always use plastic shovels to avoid the scratches.
As to the need to shovel your deck in regards to the weight of snow, that is all based on how it was built and how much weight it is designed to bear. So speak to your professional.