Cron <root at backup1> /usr/local/bin/rsnapshot -c /usr/local/etc/rsnapshot_desktops.conf daily

[root]

----------------------------------------------------------------------------
rsnapshot encountered an error! The program was invoked with these options:
/usr/local/bin/rsnapshot -c /usr/local/etc/rsnapshot_desktops.conf daily 
----------------------------------------------------------------------------
ERROR: /usr/bin/rsync returned 255 while processing backup at loom.auton.cs.cmu.edu:/home/awertz/