Any electrical cable is pushed through a hole between wall studs or through the top/bottom plates. It’s not wierd at all....
Redundancy is great for multiple wire pulls. If this was your place and you were going to be constantly tinkering and adding cameras or ir illuminators, it makes total sense. For what you are doing for your parents though, unless you know you are going to add in the future, it is overkill. There is no moving parts or wear on the wire. As long as it is terminated properly and weather protected -unless their house is routinely struck by lightening, one pull to each location will likely cover what they need.
Everyone’s situation is different. A pc with BI works for some, probably better for others. Same for an NVR... If your parents are tech savvy, know their way around a computer and have space for it, go pc/BI. If they struggle to turn on their television and DVD player, consider an NVR connected directly to their tv. It will be the most comfortable for them. If you overload them with technology, they will not use it at all and the effort will be for nothing... BOTH options are going to require work beyond plug and play. There are camera settings that do need to be tweaked at the device it’s self.
The wiki and cliff notes cover what you are trying to figure out. Sounds like the most efficient option is one run per camera and to a switch somewhere. Then from the switch to either a pc or NVR. If you want internet access to remote in or so they can check via phone, there is going to be even more work. Search IPCT for “VPN for noobs”.
Thanks for being so helpful! I had figured two wires per camera since that's what the wiki recommended and it does seem like a good idea in case something happens to one cable. But I guess one cable is easier, the hole is smaller, and it should be good for at least a few years.
The NVR connected to the TV is a good idea. They're not very tech savvy. The PC instead of NVR is attractive because it seems like, if I use Blue Iris, they can just use the Blue Iris app to access the cameras remotely without needing to set up a VPN. Does that sound right?
Somehow, this whole thing seems pretty daunting. I guess it's because it's not a field I'm used to and it requires many components coming together including actual labor in mounting cameras and running wires. It wouldn't be so bad if I had more time, but I'm only home for a week and the plan is to have everything ready and have it all running before I leave. Part of me wants to just install a Ring Floodlight and Ring doorbell and call it a day, but after reading these forums, it just seems like a subpar option.