if you're building a PC, then get a motherboard that has lots of m.2 slots that fits what you need as well as sata slots.
You don't have to fill them up right away.
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.
if you're building a PC, then get a motherboard that has lots of m.2 slots that fits what you need as well as sata slots.
You don't have to fill them up right away.
Build, lots cheaper. I did. Went to used pc store. Bought cheap case with a lot of HDD slots. Up to 14 of them with add-on hardware. HBA-LSi card. b550? board, i5-6 or 7 cpu, 16gb ram, 128 gb ssd for os, 256 gb ssd for cache for the hdd when I transfer in/out. I got exactly what I needed. And not a build predetermined and spec'd by someone else.