I don't play this much lately, and want to free up some disk space, but also don't want to lose this if/when it gets removed from the Steam store.
I think if I completely backup these 2 folders, I will be able to restore them later and get the full game back:
C:\Program Files (x86)\Steam\userdata\*random number*\385760\remote
C:\Steam\steamapps\common\NBA 2k17 (this has data + modded folders)
Does this sound correct?