I currently don't use SnapRAID, my only protection atm is Drivepool. I'm not too worried about the drives suddenly failing since I have scanner which should help when recognizing if one is going bad. I'll probably have to think on the 3x duplication but probably will end up doing it. Doesn't hurt getting a bit more protection.
P.S - Want to make sure I'm reading this correctly the N+1 in this situation would just be 3?