Video Review: TimeMachineScheduler
Undoubtedly, the most-awaited feature in Mac OS X Leopard was Time Machine, the automatic backup software that allows you to visually go back into time on your Mac. However, Time Machine wants a little too much control. There is no option for you to set the interval of time between automatic Time Machine backups. That is until now. TimeMachineScheduler puts you back in the Time Machine driving seat, and lets you schedule when you want Time Machine to automatically backup with a simple slider.
Check out how easy it is to set your backup duration in this video review.
TimeMachineScheduler is a Universal binary distributed as freeware by Stefan Klieme.


Nice little app. What would happen to files I worked on or downloaded within that interval (say 3 hours) and accidentally got deleted?
@Tarik: You would lose those files because they were never backed up.
Finally someone made a nice GUI to this helpful macosxhint. going into the system files was a pain in the butt.
An interesting alternative to Time Machine —
http://www.crashplan.com/features/timeMachine.vtl