If you find this interesting then you might also be interested in SnapRAID: https://www.snapraid.it/

> SnapRAID is a backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures.

> SnapRAID is mainly targeted for a home media center, with a lot of big files that rarely change.

> If the failed disks are too many to allow a recovery, you lose the data only on the failed disks. All the data in the other disks is safe.

I'm not affiliated with any of the projects.