a. You can back up your data to google drive using the following steps.
1) Go “Settings”.
2) Touch “System”
3) Touch “Backup”.
4) Activate “Back up to Google Drive” in the open window.
5) Add backup account
* 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”.
b. You can also transfer content from your phone to another one, to back up data. Go “Settings”->”Advanced features”->”Switch Phone”, a series of screens will lead you through the data transfer process.