Now that I have built a server / PC together, I would now like to make it a server. Which operating system would you recommend?
(I would like to host websites, be able to make backups online and run a Minecraft server at least…)
I would recommend Debian Linux for your use case.
M.M.n. The best server is OS FreeBSD.
Is Minecraft / Minecraft Server now available under FreeBSD again? A few months ago, when I tested it for the last time, unfortunately, we couldn't (anymore).
That's a good question, the last time I did it was 2 years ago. I would have to test in a VM, if it works.
And your hardware can do it?
There's no "best operating system".
In the use case mentioned, I would recommend Linux.
Yes