150GB is nothing. For those who get by without needing Terabytes for Unreal Engine, please share your secrets. 
See this thread below for example. Especially as it still makes sense to work with 4.27 & UE5 for now too, as there’s lots of subtle implications if you don’t. 
Too many details to go into here, but for now Physics / BP Nativization / Editor stability for starters.
Plus there’s also managing assets and projects. You’re looking at having to have many TB’s to hold all the different backup versions of projects, different engine versions and different marketplace packs to fit all the different engine versions. This all adds up. Especially when you factor in DDC storage too, across all the different engine versions. 
Or you can always stick to just one engine version, the latest and greatest, but that can mean lots of other ‘gotchas’. 