Any sifu here know how to change the playstore country to others?

btw guys, I know this question has been asked a numerous time but there wasn't any straight forward answer at all.

What is the best way to back up all data and phone settings of an unrooted Note 4 pls? any free apps for that or just use the phones backup and reset function will do? really scared to play with it leh bcos if something goes wrong, all data and contacts gone, all setting gone....very tedious on leh.  I did some google but just could not get any solid answers

any sifu can guide us pls 

thanks
I am tired on flashing custom ROM already
maybe got 1 day will do same thing for note 4
DN ROM is good, some dev even port the DN rom for note 2 rom to s3
because he use DN ROM

i am torn between rooting or not all the time cause of the warranty. If your note 4 suddenly need repair what are you going to do? flash back to any stock fw? 

are you using stock ROM or custom ROM, i'm with wanamlite and this problem arised starting on v2.1 and v2.2

yeah, be careful. last time i bought a pair of dumbells for 39.90 (Original was 200++) then after checking out and paying, the send me email a week later saying it's sold out and will refund. i go to their website and see the dumbell still selling there but the price went back to 200++. I was damn pissed...