I used this obscure operating system with my NAS - here's how it went
XigmaNAS is a lightweight, open-source OS that combines a FreeBSD base with the typical features you'd find in a NAS-oriented distribution

TrueNAS Scale, Unraid, and OpenMediaVault stand at the apex of the Network-Attached Storage OS landscape, with each distribution featuring its own perks and quirks. However, they’re far from the only options at your disposal. Even without harnessing the power of virtualization, you can turn Proxmox into a reliable file-sharing server once you arm it with the right set of packages – and the same holds for Debian, Fedora, and other general-purpose distributions.