if i upgrade to oreo beta programme should i have to back up my data ?? does it erase my data

s8 best battery back up

s8 july security pstch when will it available

i had bought Samsung galaxy s8 i m facing a big issue my phone takes 4 hours to charge fully in fast charging and sometimes during charging its just stop doing charging like for example if charger is connected on 60% aftr 1 hour i checked its only 62...

please samsung there should be an exchange offer for s8 because i just bought s7 of 45000 and now you are launching s8 around 50000 so from where we should arrange rupees to buy it so there should be a exchange offer so we can buy s8 please think and...