ya'll experts correct me if I'm wrong, but this is the way i've thought about it in the past:
basically: if you have a freeze protect setting, you're fine. the filter pump and polaris pump will turn on and off periodically when temps are low to keep from freezing up. if you don't have a freeze protect, change your programming schedule or put it in service mode and just leave the pump and polaris running until the freeze is over.
the problem becomes if you lose power for an extended period of time like many Texans did in the snomageddon of Feb 2021. In that case, when your power goes out, cut the breaker to your pool (so it doesn't kick back on randomly with everything drained), open the drain on the filter casing, pump, salt cell, any equipment above ground you can empty out. ...then hope for the best. I think you can consider throwing blankets or towels over the external equipment after it's shut off and drained, but not sure if it will do much. ...and I think many of the valves are made to break easily so the hope is a valve breaks first and can easily be replaced and no pipes will break.