I would not worry so much about back up power and concentrate on getting the water out of the lines. My dad and I used to put a number of camps to bed every year and we just put anti freeze in the toilets and sink traps then made sure the water pipes were drained and left open. Where you run into trouble is if there is a low spot in the pipe that can't be drained. In that case if you have access put in a drain or blow the pipes out with compressed air; not too much pressure. The pipe won't burst from freezing unless they are full of water with no room for the ice to expand.
If the power does go out and a generator kicks on or a battery how long will that last? Unless you have a serious generator it will run out of gas in 3-4 hours.
My next thought is to have someone available to check in on the place once in a while and for sure if the power fails.
PS don't forget to drain the hose and internals of the washing machine and ice maker.
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