With 1TB, you have already a pretty solid base to rebuild civilization.
Then you can go deeper:
As of last year, all Library Genesis for nonfiction is 40 TB and Scientific Papers are 78.5 TB. Total Library Genesis seems to be 220TB.
Finally, you can go bigger: The total size of archive.org seems to be around 212 PetaBytes. That's some serious storage required.
If I had only one floppy disk, it would be a selection of philosophy books from Socrates, Aristotle, Marcus Aurelius, Thomas Aquinas, La Boetie, Kant, Spinoza, Descartes, Nietzsche, Wittgenstein.