An inverter: You could do this two ways: car battery with an inverter or buy a converter for your vehicle.
UPS Battery Backup Surge Protector: Marketed toward computers, this would be the best backup power option for your incubator in my option.
Generator: We invested in a used generator for our home last winter just in case we needed it.
If you do lose power, cover your incubator with a warm blanket and move it, if possible, into a warmer area of your home.
I like to check for planned outages before I start my incubator up, it isn’t always foolproof but if one is planned I can either wait or have a plan in place.