I have a 9th generation Celeron mini pc and I want to leave it on 24/7 to serve as a personal server.

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My main goal is to be able to keep running scripts I make in python (I’m studying computer science), create a personal VPN and also be able to manage some files, put or remove movies to use in something called “plex”.

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What would be the best operating system to do this?

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Important detail, I’m going to keep this mini PC in my house, but I’m going to live abroad for a few months, so remote access would be a fundamental part.

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PS: I have 0 experience in home servers.