Infrastructure is difficult. I have to run 2 ISPs these days. FTTP and DOCSIS.
The fiber line is obviously my primary and it's completely flawless when it's working. The problem is that about once or twice a year a utility contractor will break the fiber in my neighborhood and it can go out for up to 2 days. Cellular service is not sufficient to cover. The cable connection is what I use when the fiber goes down hard like that. I don't bother with a multi-WAN router or anything. It's a manual cutover thing. The cable can obviously go down too, but it follows a different path (power lines vs buried). The cable is more likely to go out, but it can be resolved more quickly assuming a localized incident.
I was looking at using starlink for backup, but there are caveats with satellite connectivity in the woods.
Satellite signals are low power and rely on line of sight. If he's properly in the woods, especially surrounded by hills, the trees could become a hinderance.
My home is in the woods. Took me a while to switch to Starlink because it was difficult to get line of sight. Eventually, Xfinity pissed me off so much that I was willing to move heaven and earth to move to Starlink. I ended up running a 300 foot cat6 cable through a pond to the back of my property to the only place I'd get line of sight and it's been working great. If you have to pay someone to climb up a tree and mount the dish so it's above the tree line, it's well worth it.
The fiber line is obviously my primary and it's completely flawless when it's working. The problem is that about once or twice a year a utility contractor will break the fiber in my neighborhood and it can go out for up to 2 days. Cellular service is not sufficient to cover. The cable connection is what I use when the fiber goes down hard like that. I don't bother with a multi-WAN router or anything. It's a manual cutover thing. The cable can obviously go down too, but it follows a different path (power lines vs buried). The cable is more likely to go out, but it can be resolved more quickly assuming a localized incident.
I was looking at using starlink for backup, but there are caveats with satellite connectivity in the woods.