I can't do a battery backup as my pump is outside my house. I was told the batteries aren't made to withstand the elements even with the plastic cover. My basement will start flooding in 2-3 hours when the power goes out. Last few years we have lost power 3-4 times and it's usually longer than 2 hoursThis^
We just installed a dual sump pump system with battery backup. That's really all you need. Especially since most of us are now on the comed smart grid power outages are nothing like they used to be.
Hell years ago my parents lost power for 3 days after a major storm. Went out and spent a ton on a huge generator. Guess what...... used it 2 times since it was purchased.