Each appliance stores a clone image that, initially, is the same as the factory image. If the appliance experiences an abnormal shutdown four times within a half hour period, or if it is restarted six times within a half hour period, the appliance assumes the current configuration is faulty and automatically replaces it with the clone image.
If the default factory image is restored, you must either reinitialize the appliance using the instructions in the Getting Started guide, or, if you have saved the appliance configuration, use an AUTOLOAD.NAS file to restore the configuration. See The AUTOLOAD.NAS File.
To prevent automatic restoration to the default factory settings in the event of system problems, you can overwrite the default clone image after you have applied an alternate configuration to the appliance. You can also apply the clone image as an alternate method for reconfiguring the appliance. For more information, see Actions Tab.
IMPORTANT: You should update the clone image whenever you perform an upgrade. Be aware, however, that this process causes the appliance to reboot, resulting in a temporary interruption of services. See Upgrade Tab and Actions Tab.