I use the Swiftfin client since I’m not willing to pay a subscription for Infuse. It works fine for video, except the major pain point for me is that it doesn’t refresh automatically, and you can’t refresh from within the app. So if you want to see new items on your server, you have to force-quit / swipe away Swiftfin and reopen it.

I’m not sure how it does it, but my Synology NAS can act as a Time Machine server and my laptop backs up to it, no cloud involved. So I know it’s possible, but I don’t know what kind of open source solutions are available.