Comments & ID Thoughts
My guess would be Gasteracantha sp. but not sure which species as there are not much spiny-back orb weaver photos that looked like this. The closest I got after extensive internet search is photo of similar looking photo taken in Aceh Indonesia but was merely identified as Gasteracantha sp. This picture was taken at Perkasa Hotel Kundasang, Kundasang a town at the hill of Mount Kinabalu. The web was between branches of shrubs growing below the pine forest.