Default [Q] Lonovo Yoga Tablet 8 Back Up Rom

Good evening I bought the yoga tablet 8 and I want to do root but before I do I want if someone can tell me how to make a back up rom the tablet as it is now so if something goes wrong to restore as it was ...


Model Number :
Lenovo B6000-F

Android Version :
4.4.2

Karnel version
3.4.67

Software version
S100

HardWare Version
H-3-01

Thank you very much and sorry for my english not so well ...