Application data like that should be stored on your SD card. I bet there's a folder on there that contains a text file with all your vehicle info. Simply copying it from the SD card over to your PC will work as a backup in case you lose your phone.
Just did a quick read, looks like the Photon doesn't come with an SD card, so you'd have to put one in yourself, then you have to go into settings>>Storage and change your storage location. Christ, this is why vanilla android is better, hasn't been assraped by manufacturers.