Take a look at FreeNAS. It is FreeBSD, which is self-recommending for things like NAS, built on ZFS (all the nice parts of a modern file system like snapshots,

Take a look at FreeNAS. It is FreeBSD, which is self-recommending for things like NAS, built on ZFS (all the nice parts of a modern file system like snapshots, easy backup, etc.) and has a nice management GUI. https://www.freenas.org/ https://www.freenas.org/ (I also don't recommend exposing your NAS directly to the internet. They frequently make doing so attractive with the ability to run addons like file sharing or "private cloud" services. If you must, run them in a VM on the NAS and isolate the VM from everything else on your network. And keep up with patches.)