Apple’s next generation Operating System, Leopard is pouncing onto Macs everywhere. But with any OS upgrade, you might encounter some problems or you just want to start fresh and backup your data, but what about your iPhone?

If you erase your data including your iTunes backup data or your iPhone, you’ll run into some trouble namely iTunes trying to resync your iPhone with nonexistent data.

If you want to backup your backup data (and then you can backup your backup of your backup using Time Machine) navigate /Library/Application Support/Mobilesync/Backup and drag those files to a secure location. Once your upgrade is complete, drag those files back and you’ll be good to go.

Credit to Duncan Davidson for noting the location of iTunes backup data.