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Home server/Choosing an Operating System
The most popular choice here is by far any flavour of Linux. BSD is sometimes considered better. Using MacOS will earn you derision from Linux and Windows sysadmins alike. Don't use Windows.
Contents
Linux based
Debian
Virtualisation
Proxmox
Ubuntu
CentOS
Open Media Vault
unRAID
BSD based
FreeBSD
OpenBSD
TrueNAS CORE
NAS Centric
NAS-centric operating system for a home server. Software designed for retards, with simple GUIs to set up your services.
Xpenology
A free version of the OS Synology uses for their NAS products. Obviously you won't get any support from Synology if you use this.
Supports differently sized physical disks and adding hard drives to expand as needed.