Plone is good. You can easily back it up with rsync: http://www.zope.org/Members/jrush/howto_rsync_zopeThere are also lots of documentation on the Plone site if you drill down.
Ross, Chris wrote:
Documentation for Plone is quite lacking. Backup and disaster recovery are complete unknowns to us on this type of system. Any help with suggested/known products or RTFM pointers would be greatly appreciated.