What is the network/other system you are connecting it to, 10G? Sell the MacBook and get a mini with 10G.
Data Hoarder
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.
No, this is trying to solve the wrong issues.
What's the internet connection like?
How do you currently store files? Qualify what you think is large - 10gb, 100gb, 1tb. What is a project size currently? How many cameras & at what resolution/codec?
What editing tools are you working in? Have you looked at cloud editors that allow for collaborative remote editing?
Do not install TrueNAS on the Mac - it's not going to work. A dedicated NAS like a Synology will be cheaper than anything done on the Mac. What is the total storage you have currently & how much does it grow per month?
This is a bad idea. Why not use the Macbook for what it was designed, namely editing things instead of hosting things?
A run of the mill PC can run TrueNAS way more efficiently and everything in one box instead of having a laptop with tons of cables coming and going from it.