Tap Backup & reset to access the following settings:
BACKUP & RESTORE
Back up my data: Checkmark to backup application data, Wi-Fi passwords, and other settings to Google servers.
Back up account: Opens a dialog box to select the account to backup. You can also add an account for backup.
Automatic restore: Checkmark to allow the device to automatically restore backed up settings and data when an application is reinstalled on the device.
PERSONAL DATA
Factory data reset: Opens a screen to erase all of the data on the phone. Read the warning, then tap Reset phone at the bottom of the screen.