The newer versions of the ZP-NE24-S do not support access over a direct web interface. On the older versions that still support the direct web interface, the media port is NOT able to be secured. This is why that feature was removed.
If you have the older version, you can open the media port (typically 8000), and it will allow you to access the device in IE, but it would also give the rest of the world complete access to your system without you being aware. All they would need would be your public IP address.
Your public IP address is available to anyone you have contact with through the internet. All websites that you access collect and store your public IP address.
There are websites and servers dedicated to finding unsecured video surveillance systems and broadcasting those video streams to the public. So, you would be able to back the video up remotely, but everyone else would also be able to back the video up.