Go to CCTV system
Right click on any part of screen
Click playback
Select date required
Go to time you would like to save (suggest a few minutes before required time)
Go to bottom left corner and select the scissors icon 'start clipping' leave footage to play until selected time end.
Once at required time end press the same button (scissors) 'save clip(s)' this will bring up a menu panel
Plug in usb
Select files to save
Press export
Check the correct storage device is selected on the top of the menu panel
Click export.
Once files have finished exporting click ok
Remove usb device.