Tangentially, there's even larger public datasets coming out of astronomy. PanSTARRS' imaging survey will make 2 PB available online. They even have a picture [0] of the completed dataset in transit, if you wondered what 2 PB of HDD's on a flatbed looks like.
[0] https://archive.stsci.edu/mug/mug_2016/PS1_MUG_2016jan14.pdf...