[alecbaldwinlol]

That's all good, it would just increase the number of disks required to be purchased and the amount of electricity/cooling/floorspace to maintain them. It would add to the disk count, but not really affect cost per TB all that much.

How do cloud storage vendors guarantee triple-mirroring and uptime then? Lots of 2TB drives? Lies? :)

[rz2k]

Does it say triple mirroring or triple redundancy? Take a look at the article from Backblaze for an overview of the math. In their case it might be called quadruple redundancy. 20 shards hold 17 shards of data with triple parity. Events destroying hard drives containing information about your data could happen three times, and you still wouldn't lose anything.