We also have a Transfer Appliance [1], that comes in two sizes (100T and just under 500T). We don’t currently support shipping one filled up with your data for recovery/export though.
You can also request a "B2 Fireball" [2] from them. It's basically a small array that they mail to you for $550 with 70tb of storage. You fill it up and send it back to them within the month, and they'll load the data into your account.
[1] https://www.backblaze.com/b2/cloud-storage-pricing.html (Bottom of the page)
[2] https://www.backblaze.com/b2/solutions/datatransfer/fireball...
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.
There are 3rd parties that will do it for you (Iron Mountain is at least one) but that's an extra cost and Google takes no responsibility for it. I assume this is an example of a place where Amazon is able to leverage its wholistic business, with a Cloud service that can also take advantage of their physical logistics system. Google's service here is quite significantly cheaper and has some nice features though, but even if it's not worth a $4/$1.23 premium for Amazon I could definitely see continuing to pay Amazon some premium ($2 vs $1.23 say) for that alone anywhere with limited high speed WAN availability.