$5 for unlimited backup storage? Wtf?

I'm sorry if this post sounds like an advertisement, but it is not.

I ran into this backup service yesterday. It's called Backblaze I was pretty surprised when I saw the price... $5 a month for a complete backup of your computer.. that is: unlimited storage for $5 a month. That's nothing short of amazing.

I'm always looking for backup solutions, so this sounded good, but maybe a bit too good. But it seems kind of scary to trust your data to $5 backup service. A user called barmstrong on HN pointed me to this blog post by Backblaze on how they build their servers and therefor how they are able to do storage so cheaply.

Petabytes on a budget: How to build cheap cloud storage | Backblaze Blog.