I just had an awesome design thought... what if the M4 Mac Mini had internal battery backup? If the power goes out, the battery will kick in and macOS will give you 15 min. to save your data and shut everything down (or it will automatically shut down a couple minutes before the battery is completely drained). Obviously, you can't USE the system like this, but it's there as a safety cushion. That would be so cool! 15 minutes of battery life (at max. wattage use, so longer, if you're not pushing it hard) should fit in the Mac Mini case easily. A countdown timer appears and shows you how much time you have remaining. No need for a bulky UPS on the floor. I'd gladly pay extra for that! Make it an optional upgrade. I'd get it!