You can backup the entire server configuration, including the license key, to a single archive using the menu and selecting the Tools -> Backup Users and Settings option. The backup can later be restored using the Tools -> Restore Settings and Users option.
When restoring, make sure you have the zip file placed in a location that the Cerberus service account has permission to access. For example, if you place the file on the desktop or downloads folder of a Windows user account like Administrator, the Cerberus account likely will not have permission to read the file. This location is recommended: C:\ProgramData\Cerberus LLC\Cerberus FTP Server.
If you do not wish the license key to be included in the restoration, click the 'Do Not Import License Key' box.
Note, the backup does not include your actual server file structure. Please make sure you are running the latest official release of Cerberus FTP Server before executing your backup.