Attention: Please use “VLC”player(https://www.videolan.org/vlc/index.en_GB.html) to play the video you back up from the nvr system.
1. Insert a USB disk into the NVR USB port. Click Start -> Search and Backup;
2. Choose By Time. Click Set Backup Time.
3. Set backup time, click OK.
4. Click + inside the windows to add camera.
5. Click Backup to back up video to your USB disk.