The model for having the online version be the master file is the basis of the concept of "distributed processing." The definitive version of an organization's DB is on a central mainframe but snapshots can be downloaded either at regular intervals or at need. Then they can be used locally in various ways.

Using this model for Digitrad, the snapshots would be downloaded into a new stand-alone database, by an automated process, at regular intervals. And distributed by whatever method you like.

The on-line version would be the only place where changes are applied, and there would be some kind of clear, managed process for applying and reviewing changes.

Rita F