Sample available from MSDN download

The SPSBackupSample in this download (SPSBackupSample.exe) includes programmatic steps and code to demonstrate how to backup and restore all SharePoint Portal Server 2003 or Microsoft Windows® SharePoint Services sites in the server farm. The code shows how to write a backup and restore application for SharePoint Portal Server 2003, and to perform Web Storage System backup for backwards-compatible Microsoft Exchange Server document libraries.