Google™ Backup and Restore - The all new HTC One® (M8)
From a Home screen, tap Apps (located at the bottom).
If unavailable, tap the dropdown menu (located in the upper left) then tap Alphabetical. If still unavailable, refer to Manage App Icons.
From the PERSONAL section, tap Backup & reset.
From the BACKUP section, ensure the appropriate account is selected from the Backup account field then configure the following:
Back up my data
Back up app data, Wi-Fi passwords and other settings to Google's servers.
Enabled when switch set to ON.
If back up my data is set to OFF, existing backups are deleted from Google's servers. To turn on:
Tap Back up my data.
Tap the Back up my dataswitch (located in the upper-right) to turn on .
When reinstalling an app, restore backed up settings and data.
Enabled when a check mark is present.