I have a very nice desktop system that I've invested a lot of time and money into building. I have to leave for a year and will be giving the system to some family to store until I return. They are not very technical and won't be using the desktop at all in my absence.
What is the best way to store it so that everything still functions properly when I return? More specifically should I put it in the basement in a watertight bag? (it can get rather cold) or leave it in a spare room? Should it be plugged in and set on hibernate or not plugged in at all?
It has a NVIDIA 550 GTX graphics card and some liquid cooling systems. 4 hard drives (3 SATA one SSD). Most of the other hardware is pretty standard for a typical desktop.
I'm not sure what is the best route so any advice is helpful. The biggest reason I ask is that in the past I've just stored things like laptops in the closet and have returned to find a dead battery that barely holds a charge and the system just seems generally slower. I am not sure if leaving it plugged in to avoid full discharge on the capacitors might have some effect. I've searched for similar questions on SU but they all seem data storage related and not actually hardware related.