Hi. I am trying to back up my SD card just in case... I did it by computer, used dragging all files from the recorded card on my desk top and then back on the empty SD card, It took 2 hours to do it, new SD card shows the information is on it, but when inserted in KN7000 it does not have anything on it. Do I have to do something else or what am I doind wrong? Is there some other way to back up SD card? Thanks, reply will be greatly appreciated. Jan.