Just use oracle backup utility to back. It's a simple exp/imp operation, you can export the dbf file and save it anyware. I
In the VLM there is a tab on in the Configuraiton screen to automatically schedule a regular backups of the VPL database. This backup uses the database's own backup utilities. The terminiology used in the VLM version you have will be Export instead of Backup. In VPL version 4.2, pending release, we have changed the wordign to backup in order to minimize confusion.
If you still cannot determine how to perform a regularily scheduled backup of the VPL database, I suggest that you open a support request and a customer service engineer will be more than happy to assist.