Not a NAS, but I use a self-built computer with Windows 11 Pro, AMD Ryzen 5 3400G CPU, 64GB RAM, Dell PERC H710P hardware RAID controller, 8 x 6TB Hitachi Enterprise class SATA hard drives.  I have the hard drives configured in a hardware RAID6 with no hot spare (I have 1 cold spare) for a total of around 32.7TB of storage space and I boot off of an NVMe drive.  I've got the server built in a Fractal Design Define case, the case is sound insulated with 140mm fan mounts (the server is very quiet) and has 8 hard drive mounts, no hot swap backplane so I will have to shut down the server if I ever need to replace a hard drive.  I picked up the drives and RAID card used and cheap from Amazon and eBay, the RAID card was around $75 with a good backup battery onboard.  I use it as a file server, media server, DLNA server, etc., and used it to encode a lot of my Blu-ray discs when I first set up the server.  I've got Hyper-V installed and have actively used it for some work-related virtualization.  It's a really nice "server" with 100% uptime, and having a familiar desktop interface with the ability to run whatever software I feel like running is awesome.