rsync for Debian
----------------
If you still have an init.d based system, you need to edit /etc/default/rsync
by hand to set
RSYNC_ENABLE=true
so that the init.d script will try to start the daemon.
Note that this is not necessary for systemd-based systems; i.e. the default
in jessie! To override options for the rsync daemon on these systems, copy
/lib/systemd/system/rsync.service to /etc/systemd/system/rsync.service and
modify the copy; add required options to the ExecStart line.
You will need an /etc/rsyncd.conf file as described by the rsyncd.conf
manpage for rsync to do anything useful as a daemon (the daemon won't
start otherwise); you can look at
/usr/share/doc/rsync/examples/rsyncd.conf as an example.