The thing that came to my mind is to have all torrent links in some kind of blockchain, where new torrent links can be added all the time and if someone wants to help the community they can just download all the torrent links from the blockchain and help seeding the torrents. These can be images, videos, audios or whatever else. The problem hereby is it can get really big really fast. This could be prevented by adding size limits for specific file types and also removing torrents from the blockchain, which werent used by a user for a long time. Effectively we would have to add a counter for visits in the last 6months and also the last viewed date from a user for each torrent. That way old, not frequentely accessed data would be deleted and prevent the size to get too big.
This general approach would prevent data loss but also help decentralize data. Of course this is just a concept which just came to my mind but it should be possible to implement i think