I have a question. If I use a backup created in an iPhone 4S that runs the latest publicly available software in my a computer. Will I be able to use that backup for the installation of iOS7? Will I need a backup? Because a friend of mine, said you need to start from the start like it's a brand new phone. tl;dr, can I use the backup from my iPhone(the one on my computer, not iCloud) after installing iOS7?