I'm having a problem with the home button my iPhone, it doesn't always recognize every press so I have to press harder than I should to get it to activate multitasking, for example. If I go to the Genius Bar to get it replaced or repaired, should I back it up and fully erase it before going? First of all, I don't even know if they'll help me so what if I erase it and they end up not doing the replace/repair? I would have just erased and need to restore again for nothing. Any suggestions?