I store my extra kit, yes, that is right, I only have 2 kits and the 2002 cymbals which go with it in a storage facility where they regulate the temp and humidity. I also store some other drum gear there, none of it really valuable, except for memories sake. There are other items in this facility, family heirlooms etc.
My Export kit has been stored everywhere in the world, including outside for about 10 days and it rained. Did not bother them at all, I sometimes believe if there were an armageddon the only 2 things to survive would be the roaches and all the Export kits out there.