Viewing Uptime/Downtime Timelines provide an overview of whether a device or group of devices are online. This can be useful in determining if a backup operation failed or did not take place, because of device unavailability. You can view the total uptime and downtime for a specific appliance, allowing you to determine when an appliance was online and percentage of time it was in service. 1 Click the CDP tab. 2 Click the Reports tab on the top of the screen. 3 Click on the entry for the desired SonicwALL appliance. Click Up/Down > Timeline to view a summary timeline of uptime/downtime for a specific device.