[Zope] Move Images to Filesystem from zodb via FTP and WebDAV

I want users be able to WebDAV or FTP images into a Zope/Plone site. Once each image reaches the site, I want it to be automatically migrated to the filesystem with the same file name (worse case, cronning the migration). I don't want the image referenced or stored anywhere in the zodb following the migration - just moved from the zodb to the filesystem. I only the client to use only their zope/plone login password. I don't want to provide direct FTP or HTTP access to the filesystem or dish out server accounts for scp. Can anyone advise a possible solution to this. Regards, David