How can I back up my data on the device?

You can back up your data to google one 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) Touch “Back up ow”, touch “BACK UP NOW” on the pop up window to back up date.
* 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”.