You have the option of additionally protecting your backup with a password. Therefore the password set on the gateway will be used. If you want to restore the backup, you will have to set the same password on the gateway again.
If a Z-Wave stick is connected to the V6 Plus, you can also choose to save the data of the Z-Wave stick in the gateway backup as well. When restoring a backup, you can choose whether the backup of the Z-Wave stick should also be installed in addition to the gateway backup.