Noob, a good way of safegaurding for a flood would be to turn off all of your pumps, and stuff, wait until it has stopped draining into the sump, then fill the sump to the brim with water. That way, you know when the power goes out it will not flood. Also, after the pumps are back on and the water returns to its normal level, you will be able to to what level you should fill top off to, to ensure you don't flood.