That's a lot of data
Putting four 16 Terabyte drives in a NAS. Here’s a double-sided, double-density 5.25 floppy disk for scale.

My back-of-the-napkin math says you can fit 95 million of these floppies on these four drives. If stacked on top of each other (they are roughly 2mm), they’d be 120 miles (190ish Km) tall.
If this doesn’t blow your mind…