ASUS Zenfone 6 update.
So I wanted to ask one thing. I just got this update notification. And before I update. I wanna know the second point in that. It says I need to back up data. So what does that entail. What all do I need to back up ? Like my FB messenger chats, whatsapp data ? And other stuff. I have lots of images on my phone, lots of screenshot, lots of data. Do I need to back up all that ?