mbox configuration backup are done through mbox portal GUI. 

Login as an administrator, go to ADMIN --> Settings --> Config backup

To backup config, click on "Backup Config" button, give a name to the backup file, and click on "Save".

To restore configs, you can either click on "Upload Config" to upload a previously backed up file from your PC, or click on "Restore config" from your target backup file. Then, choose which are the items you wish to restore.