I've had my all my network equipment (servers, router, switches, and home automation hubs) on UPS from day 1. We lose power often, so it really matters to us for things to keep working. In fact, we eventually went to whole-house battery backup. But I still keep the HE plugged into a UPS.
I just use a small portable UPS like a BE425M for my HE C-7. That, along with a 50' ethernet cable, let me move it around when I was trying to pair some tricky devices early on.
Other people have had more interesting DIY approaches:
This is far from "HE's biggest weakness" and not something Hubitat needs to address any time soon.
