I did an assignment on the Blue Brain Project once. It's an incredibly complex project with lofty ambitions.

One thing that blew my mind was how limited they were by modern storage technology. Storing high-fidelity neuronal cross-section images consumed more space than what was available at the time. Each scan was crazy massive, something like a petabyte or an exabyte.

To store the entire human brain in this fashion would consume more storage space than that which exists on Earth.