Backing up is the key!
We might only realize it when we lose everything on our hard drive, but backing up is really the key in keeping our files safe and our system always up and running. There is a great free application that makes this process a lot easier. It is SuperDuper 2.1.4. They call it shareware but you can download the free version and there are only a few options that are locked. All the necessary functions for backing up are working in the free version. Once it is installed, you can choose to back up all your drive or only parts of it to either a disk image or another drive. The application is a universal binary and can be downloaded here from MacUpdate.