The folks at Backblaze have released a system they call Storage Pod 6.0, and they've open-sourced the whole works. Their aim is to drive down the cost of creating a data storage server (your own personal cloud) while they improve the reliability and durability of said servers each time they release a new version. Their first model was Storage Pod 1.0, which was launched all the way back in 2009. Back then their costs were $0.11/GB for 67.5TB of storage in a 4U box. Fast forward to 2016 and they've reduced that cost again, significantly.