Can my iPod apps be saved from annihilation?

My computer's memory got wiped recently because my Dad accidentally erased it all. All of my music, photos, and movies were backed up on our extra hard-drive. Unfortunately, my apps were not. I still have the iPod apps on my iPod Touch, but iTunes tells me in order to sync up to the computer again I will need to erase ALL of the current data on my iPod. Is there a way I can save the apps?