This is really cool: Pinchflat lets you build your own YouTube offline library by automatically downloading playlists and updates. The best part? It integrates with Plex, Kodi, and #Jellyfin.
Nothing on YouTube is guaranteed to be available forever, so this is great for preserving things like language courses or channels that might be gone at some point.
Added bonus: it removes ads, can skip intros and has a few other cool options.
Setup took me less than 10min with docker compose, it's a single self-contained container. I'd recommend to set some cutoff dates and pauses between downloads.