how to get Time Machine backup overnight instead of every hour? My (older) iMac runs 24/7 and it seems like it's constantly doing Time Machine backups which slows down things considerably.  My wife is always complaining about beach balls.

Is there a way to configure Time Machine to do backups only in the wee hours of the morning?
There's a nice looking piece of freeware worth trying called Time Machine Editor which looks like it'll do the trick.