Around 1 PB of the Archive is available via torrent for backup. The full Archive was around 10 PB back in 2012 so I imagine it's quite a bit bigger, now.
4 data centers, 745 nodes, 28,000 spinning disks
Wayback Machine: 57 PetaBytes
Books/Music/Video Collections: 42 PetaBytes
Unique data: 99 PetaBytes
Total used storage: 212 PetaBytes