The cycle goes, open the server and backup up to 1st save, wait 30 min, backup to 2nd save, 30 min, backup to 3rd save, 30 min, backup to 4th save, 30 min, restart and backup to 1st save. So the entire cycle is 2 hours. it also alerts players to whats happening at each event.
The download-- http://www.mediafire...toRestarter.zip
Just put the .bat and .vbs files in the file with your server in it, double click the RUN batch file and it takes care of itself.
This is for vanilla servers, not web hosted, not bukkit, vanilla.