WebDAV stand for the Web Distributed Authoring and Versioning.
For the end user it means file and diroctory manipulation in URL namespace. Operating systems with GUI are able to handle WebDAV resource as remote device.
Why this storage type is called cloud storage? Install this http server setup on 2 or more separate machine on different network and synchronize the data via network. I’ll use ZFS snapshots and the incremental send/receive capability of ZFS.