I got off easy this last winter: Just over 18 hours without power.
My backup includes several sheets of styrofoam that I place on top and wedge behind the enclosures and several rolls of backer rod to jam underneath the enclosures and into every corner that I can access.
Portable power includes the already named backup power unit for my computer and a couple battery jump starters with work light fixtures that hold heat lamps.
When that isn't enough I go into lazy mode and light up the triple infrared pads on the propane bottle. The pads are cheap and since they mount directly to the propane bottle the whole heating unit is totally portable and can be placed anywhere it's needed.
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