nVideo

Hi. I have problem with my avc787 16ch video recorder. i must backup 500Gb files each month from hdd without file system type. How can i do this? From software maximum file size is 500Mb. I try to backup from usb and tried to put the hard disk with 500Gb vfat to the USB but it is not recognized. Is the maximum size of USB drive same 500mb? I need full backup? Can anyone help?

I have to keep clips in the archives of the last 3 years for EU hasap. Does the recorded files in a normal format such as avi or mp4? And if they are full of quality clips of the DVR?