Comment currently unused functionality
Comment currently unused functionality

(cherry picked from commit f84b1b728d11b95f06dda470d800583992a3c09d)

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend