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Docker
The container platform every service in this stack runs on: isolated, portable, and easy to update.
Docker packages each app together with everything it needs to run into a self-contained container, so it behaves the same way regardless of what else is installed on the server. Every service described in these guides (Jellyfin, Immich, Nextcloud, all of it) runs this way.
It's the foundation the rest of this project is built on: updates are a matter of pulling a new container image, and one app misbehaving can't easily take down another.