Minecraft PE - make backup

Hello, I am writing you about my world at Minecraft PE. I want to ask how to make backup world...on cloud, on my local storage ...every option is acceptable. I have 200 hours in my world and I dont want lost it. I found some tuts where should I find my worlds (games/mojang/worlds...) but there are no files here. Rooting my phone is ofcourse not acceptable. I tried backup it with samsung cloud but it cant be possible. It only backup app itself not saves. Do you have some metod for backuping files? Thank you for answer ("no it is not possible" is not acceptable ).