Games : if Iexplorer doesn't open your app

simply click on backups, then on the left hand side of the screen (the list not the icons on the right), click on App-Domain.com.mojang.minecraftpe. Then click Documents,then com.Mojang and finally Minecraft worlds. Then just drag and drop and or all the worlds onto your desktop. :)

Connect the device you want to transfer to and again drag and drop.