Hi
Never used before and can not test now, but if you can test, do as follow
Router(config)#kron policy-list PingIP
Router(config-kron-policy)#cli ping x.x.x.x
Router(config-kron-policy)#exit
Router(config)#kron occurrence SaveConfigSchedule at < hour ><week day> recurring
Router(config-kron-occurrence)#policy-list PingIP