How the heck does anyone have that much data? I once built myself a compressed plaintext library from one of those data-hoarder sources that had almost every fiction book in existence, and that was like 4TB compressed (but would've been much less if I bothered hunting for duplicates and dropped non-English).

I suspect the only way you could have 20PB is if you have metrics you don't aggregate or keep ancient logs (why do you need to know your auth service had a transient timeout a year ago?)