Everyone jumps to parrot "Frigate" but Frigate is shit for live viewing and interactions. Live viewing is rudimentary, there is no PTZ control (as far as I know) and no voice communication.
It's strictly a smart NVR and as such it performs exceptionally well. It recognizes, records and marks events so that you can come later and find what you are looking for, very easily.
If you want interaction - live viewing, PTZ, Voice, you sholud look elsewhere. Shinobi supports PTZ, so does Blue Iris. Both can record audio but I'm not sure of broadcasting audio back to the cameras. Zoneminder is an option too, it supposedly supports them aswell but I have never tried it.
When I was setting up my CCTV, it was Shinobi vs Frigate. I had configured Shinobi and planned on deploying it but decided to try Frigate on a whim and never looked back.
In short, Frigate covers most needs perfectly but people shouldn't just parrot the same thing without answering within the context of the question.
It's worth the hassle. If you are obsessed with power consumption, consider the fact that Pis are very power inefficient. They draw less but also produce way less than other CPUs. Performance per Watt is shit. They were conceived as thinkerware. They are not reliable the way everyone here wants them to be.
Just to put your puny power concerns into perspective. My homelab draws around 130w on average. One big box with lots of HDDs, 2 Lenovo Tinies, networking.
My laptop draws more power in 24h than my homelab. If you have a desktop, the discrepancy is even bigger. Nearly anything in your household blows your setup out of the water. I live in a country with relatively high power costs and I can assure you, your concerns are nothing more than a thought experiment.
I would get the N100, get 2x2TB SSD as well as some smaller SSDs for VM and LXC storage. Create a hypervisor with the appliances you need - NAS, Docker, heck if the board has a free PCIe slot you can put a 4x1GbE NIC and spin up a networking VM too. This way you can streamline the maintenance - updates, backups, etc. And the best part is that this single box will be waaay above anything you have now.