Cron <root at uranus> /usr/local/bin/rsnapshot -c /usr/local/etc/rsnapshot_desktops.conf daily

[Cron Daemon]

----------------------------------------------------------------------------
rsnapshot encountered an error! The program was invoked with these options:
/usr/local/bin/rsnapshot -c /usr/local/etc/rsnapshot_desktops.conf daily 
----------------------------------------------------------------------------
ERROR: Lockfile /var/run/rsnapshot.pid exists and so does its process, can not continue