I went the lazy route with 1st a 215J with 2 2TB disks (mirrored for important data) and en external 3TB disk (backup/expendable data) and it got company from a 220j with 4TB disks internal and a 5TB external (same use as the 215j)
However, those are just for local data storage for me and my wife (picture), music library and a few static websites. Nothing fancy or demanding.
As I work in IT and mess about with more interesting environments, I wanted something simple at home. (next to my RPis that make up the rest of the server park, which we access via laptops) Main laptop here is a 14th gen i9 with 64 GB mem, so enough power to mess about when I’m behind it, but it’s off when I’m not.
I’d go for DIY with expensive/demanding requirements, pick an entry level when you just want to dump data and access it once in a while.