I got my iPad2 in early April and until today I haven't consciously backed it up (by right-clicking it in the iTunes devices and selecting "backup"). Although I got messages stating that it was backing up, I really can't confirm it as I have no idea where those files were backed up to on my Mac. I went to my user Library and into Application Support > MobileSync > Backup and there was a folder with this name: 348e763bbc0647d419f26d934c5592d43bfc662f and it contained some 5,000 files, all of them with similarly cryptic names. I can only assume that these are the data files but I have no idea what any of them are. Am I correct in this assumption? How can I find a particular file among all these? Say, one of my epub books?