Anna's archive has the metadata on it.

IA was around 300TB last time I checked.

libgen was around 190TB. For my own at home cluster I decided to go for 512TB but I can't host nor upload in these bandwidth requirements from here.

I started to build sth like a torrent splitter tool yesterday because I realized that all torrent clients just crash when you try to open, modify, or seed those torrents.

Edit: correction, the IA is ~15PB big, brewster kahle mentioned it in the documentary (2014)