The SPREADS projetcs is French collaborative research project that started in 2007 and lasted until 2011. Its goal was the study a distributed backup system using a peer-to-peer network.
In some way, we could consider that [S]afer is a followup to the SPREADS project. However, the differences between the two systems are so many that they should be considered totally opposed.
Nevertheless, like the SPREADS project, and many other solutions, including RAID, [S]afer's backup uses Reed Solomon erasure coding techniques.
Everything else is different: