function of a fire-wire for backing up data
a firewire is just a port on your computer, mind you they are currently slightly faster then a usb. But what helps do a backup is the program you have on your computer, not the connection to the computer.
Its just a wire type, the A wire can Xfer at about 400mbps, and the B wire around 800, also USB 2.0 is around 480mbps, its just the wire type has nothing to do with the product that has the cable. Like an external hard drive can have a usb 2.0 wire a Esata, Sata, firewire, its all about the speed of the wire, nothing to do with helping backup files except for the time it takes to back them up.
