You can click “Pause Backup” in the USBtoCloud system menu.

Once you pause your app, the icon displays in the notification area (system tray) as shown below

To resume backup, click the notification area (system tray) icon, then select Resume Backup.

You can also Exit USBtoCloud but it will not automatically restart when an external device is inserted. The USBtoCloud application on the device must then be double-clicked again to restart it. However, USBtoCloud will restart the next time your computer is started unless you’ve changed the default startup settings.