Messiah 2 will play original DVD9 games unlike ps2's modded with magic chips. However to get an original DVD9 game backed up u would need either to split it onto two dvd5 discs or to make the game smaller by cutting out some of the movie sequences or titles.
It is possible and a few rip kits for dvd9 games r starting to appear that make the game small enough but these r far and few between as the idea is still being developed and will take some time to perfect.
Hope this answers ur questions.
