That's very true, I forgot about that.

I think I have an APC Back-UPS 425VA (or 600VA) that takes care of that for a sprinkle of RPis, a firewall, an access point and the ONT outside. I like to keep my connectivity during the very brief power outages (underground power).

I've been meaning to try using an Anker portable battery as an extended-run UPS, but haven't tried it, and I don't know if it'll keep the USB port powered on continuously.