You should have the tivo Premiere 748 connected to the network, to get guide data, then you can download the shows you want to put to DVD on the computer. Its faster than going through your humax, but if you are going to use it that way, the inputs may not be active and may need to run guided setup. I am not sure if the humax is capable of transferring shows, but it may not as HD content cannot be transferred to a SD Tivo.
Original S1 (Recycle Heaven)
Series 2 (PLS, sold)
TiVo HD (XL, PLS, "652")
Juliet Basic (4XL, PLS)
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!