LG G pad 10.1 Guide De L'utilisateur page 580

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When all selected files have been restored, the tablet will automatically be
restart.
NOTE: You can set the Lock backup files option when creating a backup
to encrypt your backup files for extra protection.
On the LG Backup main screen, touch the Menu icon
and enter a password and hint in case you forgot your password. Once you
have set up a password, you need to enter it every time you want to do
backup/restore.
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> Set password