The failover part is mwan3 and any of them with a USB port would work, I think, although I’ve never done it. I’ve done it with my Asus routers.
So the next step is to define what “the whole system” is that you need in an outage, and how automatic it needs to be. Is it a laptop and the cell phone? Just tether it and keep going. Is it a laptop, a printer and the cellphone? Now you probably need the router, but the printer is your biggest power hog by far. More than one computer, or perhaps you need a switch?
9 hours is hefty, particularly if your laptop isn’t charged, but you might seriously look at a big UPS.
Also, you’ve introduced a different complexity: if you put a Beryl, Mango or Shadow between your LAN and what you want to keep working, you have to handle how that is going to work when you aren’t having an outage. With the Beryl you have 1 gig ethernet ports, so that plus routes might get you going day to day. But the Mango/Shadow has 100m ethernet ports, so you may be strangling yourself with the LAN routing.
I think maybe you map out the power on/power off diagram, and then figure out how to power it.
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