North of 40PB nowadays. You can find these stats buried in their public links. They do not hold up well to traffic so I will not link them.
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