I'm actually just running Windows 10 Pro with DrivePool and Scanner (Software RAID 1). This is going to be an entirely new box that I was going to use as the "NVR". I have a W10 Pro license and I'm just going to attach some storage to it and leave it on it's own independent VLAN. I'm still deciding how I want to do this, but I'll probably just place a Unifi wifi on that same network so we can access it with our surfaces and laptops.
That said, if something like Synology or QNAP is a better idea, I'm open to looking into it. Are they able to run software like Blue Iris and such?
We live in a nice neighborhood and do not have any problems. This is more so for when we are on vacation or the oldest is home alone and likes to sneak friends into the house

My wife is a stay at home, so it's also nice just to have the entry points of the house covered and maybe a front door camera so she can see who is at the door. Things like that.
You basically have 3 storage options:
1. Edge (like an SD card in the camera itself)
2. Local storage (like an NVR device or VMS server)
3. Cloud storage (online)
As well as 3 basic types of systems:
1. NVR or PC-based recording systems
2. Cloud-based systems
3. Tivo-style systems (basically a digital VCR with a wired or wireless camera bundle)
Foscam cameras are pretty popular, I have a couple & they work surprisingly well for the relatively low cost of the devices. Many of them have a MicroSD slot for edge storage, can record to a VMS like Foscam VMS or Blue Iris or to an NVR like a Synology or QNAP unit, and can also record out to the cloud, like Foscam Cloud.
It also depends on how you want to manage it. There are a lot of great turnkey camera systems out there like Nest (Dropcam) Cam, Amazon Cloud Cam, YI, Ring, and Arlo. There are also Tivo-style kits from places like Zmodo, Swann, Zosi, OOSSXX, Best Vision, etc.
leave it on it's own independent VLAN. I'm still deciding how I want to do this, but I'll probably just place a Unifi wifi on that same network so we can access it with our surfaces and laptops.
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it's also nice just to have the entry points of the house covered and maybe a front door camera so she can see who is at the door.
It sounds like (1) you have security concerns,and (2) you have a limited number of spaces you want to monitor. Based on this, I'd suggest a Ring or Nest system. Their account security is pretty good & the system is pretty easy to install & effortless to maintain. Up-front cost is a little pricey, but you never really have to worry about it after that. The slim HD doorbell is $250:
https://shop.ring.com/products/video-doorbell-pro?variant=56549588171
They have various outdoor cameras, which you can also get with flood lights or spotlights, and they can be battery-powered, solar-powered, or hardwired:
https://shop.ring.com/collections/security-cams
If you want a system with indoor cameras, Nest is also excellent. You don't have to worry about maintaining a server or the software crashing or opening up ports on your router firewall or putting them on a different VLAN or anything like that, which is nice. On the flip side, since you already have a server ready to go, you can get some cameras like Foscams for significantly less money & feed them into your pooled storage system. Lots of variables to consider! Mostly boils down to budget & goals.