If you get the jitters when using Terminal, the CLIX may be for you. It has all those bizarre Unix commands built in, so all you have to do is find the right one and click it. And you just might learn a few along the way.
Yet another backup app getting good reviews is called, in the tradition of the many iApps, iBackup. It gets especially high marks in the ease-of-use department.
There's maintenance stuff your Unix-based computer does every night, but if you're like me and turn it off at night, that won't happen. So get MacJanitor to do it instead, and keep that Mac purring.
Onyx does a ton of stuff to help clean up and maintain your Mac. There are some things I can't get to work, so I hesitate to give it a full recommendation. The program is quite popular, though, so you might have better luck.
PsyncX allows you to make a backup of either one part of your hard drive or the entire hard drive to another computer. In addition, it allows users to schedule backups.