Basically, you can have your server follow another instance as if it were a user account. Assuming the remote instance allows follows, their local feed gets duplicated to your federated feed. If they allow mirroring, you can configure the server to mirror in different ways. You can mirror the N most viewed videos, new videos, and 'trending'. Then you can set a disk capacity limit, and have videos fall off after so many days. Presently I'm sitting on 320GB of mirrored videos. 300 is automatic mirroring.
Then of course you as a user can manually request a video be mirrored. I typically mirror everything I watch. I wish it had an option to automatically mirror your subscriptions, but it should be fairly trivial to write a script that does it.
Then of course you as a user can manually request a video be mirrored. I typically mirror everything I watch. I wish it had an option to automatically mirror your subscriptions, but it should be fairly trivial to write a script that does it.