A few years back I worked at a home. They organised the whole data structure but needed to move to another Providor. I and my colleagues moved roughly just about 15.4 TB. I don't know how long it took because honestly we didn't have much to do when the data was moving so we just used the downtime for some nerd time. Nerd time in the sense that we just started gaming and doing a mini LAN party with our Raspberry and banana pi's.
Surprisingly the data contained information of lots of long dead people which is quiet scary because it wasn't being deleted.
Tails is easily the distro which surprised me the most. This is because, even tough I would rate myself a well aware privacy advocate, I didn't expect to see a full suite of privacy tools. I somehow just expected, that it would be just the Tor Browser and nothing more. I don't know what I thought tough. I need to mention, that Tails was one of my first distros I've used so I was kind of mindblown that all these tools could fit onto a USB Thumb drive.