I seem to remember that you could get it back on there. It might require that you copy off the original data instead of the converted data. But I'm not really sure. You could always save the recorded data to a VCD to keep it. Then you could just play it back on your DVD player.

To be honest, I'm too much of a scaredy-cat to attempt this hack right now. It seems very cool, but I don't feel like possibly tossing my TiVo down the drain if I screw it up.