I currently have two Hoppers with Sling and three Joeys. I have external hard drives connected to the two Joeys. I have noticed that I only can play from content on the external hard drives from the Hopper that is connected to. I can't play the content of the external hard drives from the Joeys or from Dish Anywhere. Each of my Hoppers has a 2 TB hard drive and I can connect two 2 TB hard drives. With my present set up, I can play my recordings from either of the the Hoppers. I have access to 4 TB of recordings from Dish Anywhere or either of the televisions that are connected to the Hoppers. With the Hopper 3, my option would be to have one Hopper 3 and four Joeys. I would only be able to play 2 TB of recordings from the Hoppers or televisions that are not connected to the Hopper 3 and I would only have access to 2 TB of recordings from Dish Anywhere. At least this is my understanding from reading through the threads. I presently don't have a 4K television. I live alone and rarely have need to record more than 5 programs at a time while watching a 6th.