If you have ice and snowing weather that has a potential for power outages, then you should have a backup generator hooked to your pool power source. If you do not then I would winterize the pool and the spa. Put a portable spa up next to the house it will be more energy efficient and you will not have to worry about it freezing in a power outage (it has enough insulation to keep itself warm). If your concerned about the cost of a portable spa don't be they are cheaper than repairing the plumbing and replacing all of your equipment.