Then I’d definitely set up a test system in a VM on your own PC (I.e. not the actual server machines). Even if you don’t want to use Docker, you can set up a complete version of your new server and practice deploying Jellyfin and Plex, and then test accessing it “remotely” to manage it. You can then decide whether switching away from Win11 is worth it.

If you’re not familiar with the process of setting up a linux server then I’d actually suggest Debian instead of OpenSuSe. Looking at the Jellyfin guide for example it specifically covers the steps for installing directly onto a Debian host (while OpenSuSE set up means using the Fedora RPM guide). There are also straight forward guides for setting up a Debian server.

Personally I’m not a fan of Ubuntu (because of Canonical and Snap etc) but there may also be a good choice just because there are so many guides out there for setting up Ubuntu server.

Docker is pretty easy to use, and is easy to play with either on your own system (linux or windows) or in VM guest system. The learning curve isn’t that high and Jellyfin for example has a clear set up guide for docker on their wiki.

But radarr, sonarr etc can be installed directly within linux without docker. The Servarr wiki (that these projects use officially to share information as they’re so similar) has lots of straight forward guides for set up on Linux, Windows, Mac etc as well as Docker.

I have a Linux guest VM set up with a Radarr, Sonarr etc set up, VPN and torrent set up. It was easy to do and means its network activity is all securely contained away from my host system. The tools let me set naming rules and file preferences. The library is a shared n folder in my host system, and that is included in my Jellyfin library. So all I have to do is subscribe to something i am interested in and it will just appear in my library once downloaded. The servarr tools are extremely convenient and worth looking at if you’re adding to that 30tb library over time.

OpenSuSE is a good distro with nice tools like Yast that have a decent CLI interface, and has server releases. The leap edition is stable but relatively up to date.

But there are lots of viable alternatives, and if you’re going to use Docker then the host distro is probably not as important as you think.

Simplest route may be to set up a demo server within a VM and see which one chimes the most with your style of use and maintenance. You could have a functioning demo server with docker and deploy both jellyfin and Plex in 20mins.

Atomic systems or rpm-ostree is an interesting concept and may well be the future of distributing linux, but it has a lot of compromises. It may not be the first place to start when leaving windows.

The problem is all the apps and things you may wish to do with your OS. Flatpak is the preferred method of installing apps as it doesn’t interfere with the OS, but that is a compromise that means more overhead for running apps including memory and disk space, and less integration with the host OS than traditional apps.

You can overlay native apps but the more you overlay onto the immutable os, the more complex upgrading gets and the risks of breaking stuff.

I’m not sure I would be starting with an immutable OS when switching away from windows. While it has a lot of theoretical benefits, its a work in progress and with significant compromises at the moment. Your VPN may just be the first of many programmes you find you need to overlay.

I personally would look at a more traditional install, get it working how you like and if you find Linux works as a permanent home then think about how you might recreate that with an immutable OS base. If your needs a re very simple then maybe it’ll be easy, but if you’re using lots of software and tools (particularly if its not available Flatpak) or custom OS config you may find atomic desktops are not yet quite ready for you.

It could be frustrating and off putting if you try linux immutable, find loads of problems and attribute that to linux when its actually the immutable OS that’s the cause.