Forum OpenACS Development: Re: Reactivating oacs-dav with file-storage?
One could also find something that has the same level of transparence of a "real folder", as e.g. davfs2 for linux http://savannah.nongnu.org/projects/davfs2 (this also seems to work with our code)
On my windows 7 vitual machine I could no connect the native webdav client not even with my owncloud, so it is some task indeed!
Another thing we did was setup poatgresql based SFTP authorization from the openacs database with an external file storage location for the content repository and a trigger to add items to the database. You'd have to explore the security implications of that a bit.