[olov]

I don't understand your claim about redundancy. Amazon says that Glacier "is designed to provide average annual durability of 99.999999999% for an archive", https://aws.amazon.com/glacier/details/#durability. This seems to be the same as for S3 objects. Furthermore, they say that "the service redundantly stores data in multiple facilities and on multiple devices within each facility".

So multiple facilities and multiple devices on the same facility (I guess that means at minimum 4 copies), and a calculated annual durability. Not so secret?

What are Backblaze's (and Crashplan's) redundancy policies?