At a recent Mac user group meeting a member pined for a way to change the one-hour interval of Time Machine backups in Mac OS X Leopard (10.5). Solution found!
TimeMachineEditor: Version 1.2.1 was just released. Here is it's site LINK.
And it's FREEWARE! To quote:
TimeMachineEditor is software for Mac OS X 10.5 Leopard that lets you change the default one-hour backup interval of Time Machine. You can change the interval or decide to make a backup once a day, once a week or once a month.
This is useful if you don’t need to backup every hour and don’t want the performance penalty. This is also especially useful if you manipulate lots of data within one hour as you would spend the whole day backing up.
And here is the download LINK.
That should do ya! Thank you TimeSoftware!