I have the exact same fear!!! I even purchased a gas generator to run the minimal stuff on the tank. But as of right now we might have a mandatory evacuation and I can't run the generator if I'm not here!! Plus, our insurance doesn't cover the loss and I have over $1000 in corals and fish. I wish I had some good advice. The only thing I can say is you can get a smaller power backup supply at like a Staples (but they only run about 6-8hrs) and your LFS may have a battery run air pump. We have been thru other hurricanes but been lucky to only have lost power a couple of days. I hope someone out there has some better suggestions. I wish you much luck & blessings with your tank, hope you make it thru safely!