Desktop: Windows Vista Home -> Windows 7 Home -> CentOS 7 -> Debian 8 -> Arch Linux -> OpenSUSE Leap 15 -> Debian 10 -> Slackware
Slackware is probably where i'll be for the rest of my time on Linux, as unlike other distros, I have no major complaints.
I've always hosted stuff at home, even as a kid, so for my homeserver:
Server: Windows XP Pro -> Windows 7 Pro -> CentOS 7 -> CentOS 8 -> Artix Linux -> NetBSD -> OpenBSD -> SmartOS
I don't miss the days of using WAMP on windows lol
Depends on your NAS server. If you're like me and using an old optiplex, you can fit WAY more 2.5" drives in it, and they're pretty cheap. If you have an actual proper server chassis, then you probably want 3.5" NAS hard drives cuz warranty and all that.