Some editing programs and

Some editing programs and cameras do support firewire in & out. That means the camera will record from the computer on the firewire port back to the tape. So after you copy the video to the computer, depending on the program, there should be an option to export to tape, or export to FW camcorder, or something like that.

If your keeping the DV codec(sounds like you are with 13gb files) and not capturing to mpg files, when you export the DV file back it should be the same quality as the original since it was never converted.