Your best bet is to leave it on relay then. You can also get a battery backup (UPS) and plug your modem and router into that in case of power outages. The ISP usually has battery backup on their end (911), so as long as you can power your side you'll keep internet. I've been doing it for years and it works well. You can get away with a pretty small unit ($60-$100 range) and it should be able to power it for at least an hour, but probably several hours. Sent from my Pixel 4 XL using Tapatalk
Question- Does anyone know how the MB works if you have it set to Wifi but your home internet goes down for whatever reason. Power outage, general failure, etc? Does it automatically fall-back to LTE for backhaul? If so, how long does it take?