You’re talking a lot of storage - it might be worth investing in some low-end server hardware. A Dell tower or something, maybe one off eBay if you’re looking to cut costs.

I picked up a PowerEdge T110II a long time ago and it’s been… flawless. Just a simple server with a 4x4TB RAID5. No hardware problems, easy to manage. It costs a bit more - but server hardware is often just more reliable and for a NAS that’s job #1. This server just runs.

I just upgraded the memory in it to 32GB for ~$100USD. Before that it had 8GB. I needed more for restic doing backups. I probably could have gotten away with 16GB but I figured I’d max it out for that price.