For comparison, Amazon supports up to 16TB in their basic service, with an $80 flat handling fee per storage device and then $2.50 per data loading hour. Since they support 2.5"/3.5" SATA and external eSATA & USB 2/3.0 interfaces and it's a pure sequential transfer, it's not much trouble to get at least close to maximum sequential, which even for decent spinning rust should allow a good half TB an hour at least. I've never tried an SSD so I'm not sure if they can saturate 6 Gbps, but as even a 32 hour transfer of 16TB would only be another +$80 it may not be generally relevant anyway.

Amazon's equivalent to B2 Fireball is "AWS Snowball" (amusingly enough, not sure if there is a bit of fun name riffing between the two here), which is a service fee of $200/50TB and $250/80TB device, any onsite days after the first 10 at $15/day.

It's interesting how the pricing mix is on this feature though. Amazon offers lower potential ingress pricing depending on your use, though notably if you kept the Snowball a whole month the pricing would get very close to the Fireball (+20 days @$15/day brings the price to $500/$550 respectively, though the former with 20TB less and the latter with 10TB more).

Backblaze and Google are both much cheaper to get data out of though, Amazon's Glacier and descendent services remain very much deep freeze focused.

What's the shipping costs on a Snowball or other appliances?