Pro/3 has three backup facilities:

• Source-level backup backs up selected/all types of knowledge to text files using XML, NL or PR-formats. This is the most important backup since it generally can be restored independent of Pro/3 versions. It can also be edited manually if required/desired.

• SQL backup/restore backs of the entire knowledge base to a low-level restorable, but essentially non-editable text-file format. This backup is available only for SQL-type databases. Backup/restore is selected from the File-menu. Most likely the SQL database you are using has its own backup/restore facilities. These are in almost all cases preferable to the Pro/3 SQL backup option, and should thus be used.

• Session backup/restore is a simple mechanism for copying the knowledge base file upon opening. This functionality makes it possible to abandon changes during a session with Pro/3. The facility is available only for 3KB-type databases.