I had the problem that peertube redundancy only works on public videos and most of my videos are private/internal. And in my specific case I hosted them in Germany where my server is and because of routing and peering they would always buffer a lot in South Korea where I am so I had to solve it in a creative way, the S3 bucket is one part of my solution, putting it in the right country was another, which I explain in detail here: https://tube.jeena.net/w/uXZN52xsH75LbHWNt8dsLY