00               */4             *                      *                       *                       /usr/local/bin/rsnapshot hourly
30               3               *                      *                       *                       /usr/local/bin/rsnapshot daily
00               3               *                      *                       mon                     /usr/local/bin/rsnapshot weekly
30               2               1                      *                       *                       /usr/local/bin/rsnapshot monthly