Hi, I've had a hair system for three months now and am thinking of getting a second one and then using the one I have now as backup in case something goes wrong. What I'm not sure about is: can I just wash the "old" (i.e. current) system, spray it with leave-in conditioner and leave it in a box? Or do I have to keep spraying it with conditioner; perhaps once a week (?) And how long can a system stay in a box and still be ready to use if needed? I don't want to run the full term with the current system so that it would be usable just in case; but as I say, I'm just not sure how long a backup can be kept (assuming it's in a dry cardboard box with a lid, and whether any on-going conditioner is still needed. I'd be very grateful for guidance from any experienced users here and go know whether they do anything else to keep the system in good shape. (I have another question which I will post separately). Many thanks.