Slightly on topic, a nice low maintence (other than a daily/weekly backup/scrub script) option without the need for a specific OS is mergerFS, combined with snapRaid. The main benefit is you can add and remove drives/directories willy-nilly. It's been stable for me for the past 3 years, it just works.

https://github.com/trapexit/mergerfs

https://github.com/amadvance/snapraid/