Definitely less expensive than a full-fledged setup the likes of Dell or EMC but still not "cheap" for the home enthusiast as myself. Seriously though, I have either serious issues or truly rose to a new level if I need to start setting up things like this. That said, would be damn fun trying it out.
Petabytes on a budget: How to build cheap cloud storage | Backblaze Blog
Petabytes on a budget: How to build cheap cloud storage | Backblaze Blog