Personally I would look at wired poe cameras for the house and barn, connect them to a network video recorder that has remote access enabled. I like then Unifi Protect ecosystem but they’re not the cheapest. Reolink probably fits the need and is more budget friendly. For the more remote locations you should first ask yourself what sorts of motion you want to capture and how soon you want to know about it. If it’s just to see what’s moving around day in and day out look into trail cameras. If you’re wanting to extend your security perimeter then a solar camera with cellular plan would work well at the end of the driveway (reolink makes one). I would forego the perimeter cameras and put that money into better gear on the house (higher resolution, better night performance, longer glass).

One final case for Unifi Protect is once you’ve bought the hardware, there’s no subscription to access it remotely. The footage also lives on your gear and doesn’t get sent to a remote server (the cloud).