I haven’t set up a proper backup yet because I’m not sure how much storage I’d need. My NAS has ~34 TB of usable space and I don’t want to spend too much money. The most critical data fits within 1-2 TB so that should be doable, and I really need to get around to it!
They are working on getting the Jellyfin app to the Samsung Tizen store, but it’s a slow process. The app itself if working quite well already, if you manually install it (which is rather simple if you have docker installed)