Hi guys, after using Android since my first smartphone I moved to Apple. I should receive a 6s plus tomorrow, so I wanna know if there is any tips that every iPhone user must know. There are things that I already want to know like: 1)how iTunes backup work? Does it make a image of the system so it can restore the same way it was, or it just save the settings or media? 2)I mostly rely on Google for my contacts and calendar, but I want to backup my stuff to iCloud too. Is there a way for example, when making a new contact, it syncs with both Google and iCloud? 3)I read that Apple music subscribers are complaining that the service is deleting user songs and matching with the cloud. Does it happen if I don't use Apple music? I don't want to lose any music that I have. 4)should I worry about cache, or apps running in background? In what frequency should I restart the device? 5)should I factory reset after every system update? 6)On Android can see a photo like in WhatsApp and backup directly to Google photos. Can I do this on iOS? Thanks in advance guys.