@doraii depends on a few factors
my desktop has some weighty software and games on it, so I have 1tb local storage and 10tb in a nas for stuff that doesn't need to be accessed particularly quickly

my laptop is more administrative/utilitarian and only has 256gb main disk but whenever I'm online im vpned into my home network and can eventually pull down stuff from the nas if the link allows, though that's usually slow enough that I try to preload whatever thing I'm working on

I expect that most people need even less storage if they are more reliant on cloud services for everything, but the OS itself these days, especially if you're rawdogging windows or something takes up too much space