This really hasn't been covered so I figured I'd do a quick video of the process. In short, from web service you can back up files to a USB flash drive that is installed in your DVR/NVR locally. This can be a useful thing to do for someone if they need to hand a USB drive to the authorities in a hurry- like perhaps your parents or clients who don't know how to do a backup quickly to the flash drive in their unit. You can do this for them remotely and then all they have to do is pop out the stick with the files on it and go. For your own system, aside from the usual backup to the C drive in your computer, the flash drive becomes one more backup for safe keeping of critical files. Hope this helps!

http://youtu.be/uVja34mXz8o