1. Plug a USB hard drive to DVR's USB port.
2. Go to play back in the system.
3. Click play to play back video first.
4. Drag the bar to the time where you want to cut off and click scissor to start editing.
5. Drag the bar to the time where you want to end and click scissor again to stop editing.
6. Click back up next to scissor icon.
7. Click backup and select the file you cut off just now to back up.
If you want to play it on the computer, please use our player. Here is.