Start backup immediately if client requests it
Start backup immediately if client requests it

(cherry picked from commit f6579df46f18d7447cb31066ba2d1ac2adf117d3)

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