davfs is a protcol, a standard. Read that standard uf you wonder, but many things used dav behind the scenes. And apache2 is a very well established implement

davfs is a protcol, a standard. Read that standard uf you wonder, but many things used dav behind the scenes. And apache2 is a very well established implementation of it. Clients handle partial snags. I wouldn't rely upon anything that syncs like this, without backups. Any protocol at all. Of course, the same may be said for anything at all. Backups are king.