Pfffft. I remember kilobytes being a big deal.
My father used to program computers with punch cards.
Punch cards were still around when I matriculated in the mid 1970s.
Now, if he had to enter the boot-strap loader via switches, then use paper tape to start to do real work, aka, load the "driver" for the card reader to load in the application before loading the data...
As for the Petabytes. I know it seems a lot, but an awful lot of it is imaging. What's a typical page of ASCII text? 2K? What's a typed page of scanned text? A page of scanned "artful" text? A page of illuminated "artful" type? Illuminated and hand written?
That's not to mention the aging and more than likely wear and tear imperfections of the pages.
After all, if you're going to that much trouble, you might as well go state of the art the first time to minimize additional handling of the originals.
I'd like to see if they have "Cuoco Secreto", translated of course.
I started using a Card Programmed Calculator in about 1955. We not only used punched cards for programs, but we wired boards for trignometric functions.