How to back up the address book for Apple 6 mobile phone backup?

IPhone 6 phone backup address book method is as follows:

First, click "Settings" on the iPhone 6 mobile phone desktop.

Second, after entering the settings, select the "password and account number" option.

Third, then find the project "iCloud" and click enter.

4. Turn on the switch in the "Address Book" column after entering.

5. Then find the "iCloud Cloud Backup" item and click Enter.

6. Turn on the switch in the column of "iCloud cloud backup" after entering.