Q-See QSD2216 - Manual (Page 34)

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If you want to change it from the MASTER HDD to the SLAVE HDD, press the SEARCH button,
then press Enter button. Press the Menu button to exit.
6.11 USB Backup
If you want to use this function, the first step is to format USB device with “FAT” system on your
computer.
NOTE: the DVR doesn’t support “FAT32” file system.
Plug in the USB device, go to the menu of Backup set, check whether the USB device was
detected, and there is enough free space of the USB device, select the backup mode, then
completely exit the menu system. USB backup is available only in playback mode.
If you selected “STILL” for the backup mode, press the USB button and an “S” will appear on the
screen. When it disappears, the backup of the picture is finished, and you can un-plug the USB
device out and see the picture on a computer with the netviewer software.
If you select “MOVIE” for the backup mode, press and hold the USB button until the “A” appears on
the screen, press the USB button again to select the end of the backup video. This may take a little
time, and make sure the USB device has enough free space, if the “A” disappears, the backup is
ok, and you can view the video on a computer with netviewer software.
NOTE: if you backup still picture, please choose full picture display.
We recommend using high quality USB thumb drives that we provide