Hello. My 64 GB iPad is completely full and won't install iOS 8 until I make some room. I have several options; here are my two favorite ones. Option 1 - Remove only the music from it. I have 9,000 songs; this will free up 90% of it. I'm not sure the best way to do this. I'm afraid that if I delete songs from the iPad, then they'll vanish from my PC iTunes library the next time I sync. Option 2 - Back it up, do a factory reset, upgrade it, then restore from the backup. I'm leaning a little bit toward #2. But I don't know if the backup ACTUALLY backs up non-Apple application files, such as those belonging to my various flashcard and Goodnotes apps. Can anybody advise me on the best way to free up space for the upgrade?