There are 2 ways to make backup
1) use USB disk to backup
1. right click your mouse, and choose video backup.
2. choose the channel/date/time playback you need backup,
(If you copy too much backup, we suggest you copy it one by one channel to save copy time)
3.Backup, the let your mouse out and within 30 seconds put the USB to get the backup
if you need check tbe playback you copy out on computer, pls use VLC player , you can download here :
http://download.dvr163.com/tool/Video-player%20.zip
pls notes USB disk format should be FAT32 otherwise your NVR may can't find it.