If you cut or copy, it just creates a link on your laptop/ tablet and then instigates the command on the Humax when you paste, it does not copy the file/ folder to the laptop. Moving files on the same drive is quick. If you copy, you get a warning that copying takes a long time, but the link on your laptop appears just as quickly. When you instigate the copy, it then sends the command to the Humax and the copying will take a while. If you close the browser before the copy is finished, the copy process will still complete.