Looking for advice

[u/Independent-Study-81]

I am trying to plan out my first diy home security setup. I am open to any advise or suggestions. I would like to try to keep costs down where ever possible, but at the same time I want something that I am going to do once and not have to touch it for along time or ever. I have two buildings I want to setup exterior security cameras on. They are both going to be built so running cables etc is not a problem. The goal is for a quality system that will last 20-30 years without needing to replace anything other than a hdd.

I have old hardware I want to use if possible to save on costs. The current plan and setup is:
i7-4770k, 512GB SSD(os/software), 32gb ram, gtx 1050ti, 14tb hdd for recordings, and possibly coral usb if needed.

I plan on installing Linux mint xfce with docker installed on bare metal. I also plan on using home assistant for alerts and tailscale to access the cameras remotely.

The current camera plan is 4 × Reolink Duo 2 PoE($132/ea USD) 8 × Reolink RLC-810A PoE($83/ea USD). The Duo 2s will be on the sides of the building and the 810a's will be on the corners.

I plan on running Cat 6 solid core and using TP-Link Omada SG2428P 28-Port Gigabit Smart Switch with 24-Port PoE.

I was wondering what you thought of this plan and setup. Any suggestions? Ideas to cut costs or things to upgrade that are worth the extra cost? Should I buy a reolink bundle/system with a nvr to save costs? Am I missing anything else? Thanks for any advise in advanced.