Have a good guide on this? I am very interested..
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What you are looking for is a VPN or to port forward Jellyfin. Not to be confused with a Commercial VPN. You want him to Virtually connect to your Private Network. Personally, I don't trust port forwarding Jellyfin directly. So, I setup a wireguard VPN and port forwarded that. Then, connect remotely through the VPN to the local Jellyfin. Idk about Roku though. I cannot say wether they have a good wireguard app.
Idk why you got downvoted. I wouldn't call that advanced. But, we could all be happy with that setup too :)
Sure, the magic of torrents is that it's hard to truly take down. If 100 people are seeding something, good luck getting them all to stop. The next best option is to stop sites from hosting the torrent files that help you connect with seeders. But, now we have DHT that is like torrent sites automatically being peer to peer. Shits unstoppable.
But, ftp has great benefits as well for sure. Not to downplay that.
For preservation, go with a redump pack. They aim to make a collection of "perfect checksums" of every game. Badically, multiple people will rip the same game and they post a "hash" of their file and the perfect rip is the one that matches each other. They do not share the actual files, but you can get the a pack from archive.org of iso files that match the hash database of redump. This should give you the best collection.