Building a NAS if your comfortable with it is the better option, better hardware/cost generally then pre-built synology (the benefit is really they are the ones responsible for managing the experience). Once you have the case/hardware, you can toss TrueNAS on it.
Personally, I have one machine setup as a NAS, one machine as a router running VyOS (virtualized on proxmox) with core services, then a few extra machines for things like jellyfin, etc.
I have most of the pokemon collection, you can find a lot of the seasons on ebay and rip them once you get the disks. There are several auto ripping scripts out there (personally made my own, pass through the dvd/blu-ray drive and auto detect media type).
I don't have to worry about a company just not providing video service anymore for some licensing issue or something