How to properly store a Chinese new year cake and how long will it last?
I hope you ate the Nian gao cake already. If you are going to eat it in less than 10 days, just leave it in the fridge, tightly sealed in a ziplock bag.  But for longer storage, say a month or so, you could wrap it in plastic wrap, then a paper towel, then inside a freezer bag.  I would also cut up the cake so it is easier to defrost when you want to cook it.  I would not eat it after about a month.  I think that the texture would be too different after that.  But best of luck.