We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
I am not looking for a modern NAS solution with hard disk(s) you have to add manually. I want something like WD My Cloud that is hopefully just plug and play.
So you aren't looking for a good NAS, you are just looking for a particularly shitty one. Now that you've found it what's stopping you?
Does your ISP have a modem/router with a USB port that acts as a file/printer server? Then you're all set and done!!