1) Go 「Settings」.
2) Touch 「System」
3) Touch 「Backup」.
4) Activate 「Back up to Google Drive」 in the open window.
5) Touch 「Back up Now」
* App data, SMS text messages, Device settings, Call history, Contacts will be backed up.
For more back up & sync help, please continue touch 「Google Photos」->」Back up & sync help」.