You can back up the video files to external storage. Plug the usb drive in the USB 2.0 port.
Here is H.264 video player software download address for windows system
Main Menu—Record—Backup, select the usb drive.
Click backup button and the dialog box will be popped up. You can choose the backup files according to the type, channel and time. Add files, select Backup format (AVI or H.264) and click “Start”.
NOTE:Suggest backup video format via AVI, as it can be played on most player. For H.264 files, the H.264 player needs to be installed.
Get message “Backup finished”, click “OK”, then you may plug the usb out and play the videos