[Zope] How can I "export" objects without user interference

Hi! Using "export", it seems to be easy to do a "backup" of content within Zope. But to do this, I have to log in (of course I have to supply user-name and password) before selecting my object to backup and selecting "Export". So I will have to do every "backup" manually... Is there any way to "script" this, so a backup can be done automatically? --- Thanks. Thomas