How to backup contacts while formatting android mobile.

Step1: Go to contacts.
           Go to options.
           click on Import/Export contacts.

Step2: Click on where from you want to copy contacts..
   

Step3:Click on where you want to copy/backup .

Step4: Select which contacts you want to backup.

           Then press ok you get this type of popup message this will show that where your contcats   will     be saved.
          
Then click ok to that message and you'r done.
thank you.