I can't make a backup on Navigon Fresh 1.6.2. I can't find this option. I downloaded again the software, but this doesn't help.
Since the application is free of charge I recommend you to download and install Navigon Fresh 3.5.1 from the official web page. Select the version compatible with your operating system, save the file to your computer and install it following the provided steps. After you open the software click the Backup and restore option from the Welcome window, connect your device to your computer via USB cable, click Next and follow the instructions.