I was finishing a job yesterday when I heard what sounded like Steve Jobs' voice in my head: "You should backup your data." Then the voice became louder and said, "Backup your data now as data loss can occur at the worst time, like after you have finished that job." So, I backed up the data from the job and loaded iPhoto to review the work. Several minutes into the slideshow, the Mac froze with a control lockout and the slideshow would not go to the next picture, although iTunes continued playing. I did a cold boot, and as the grey screen changed to the OS X boot screen, the voice of Steve said: "That's why you should always backup your current data immediately. Thanks for supporting Apple." OS X froze at "Waiting for local disks" and there was no apparent drive activity on the IDE channel. Hard drive crash! But wait, I made a backup. So I calmly turned off the system and waited a few minutes for it to cool off. When I turned it on again, OS X did what sounded like a Verify Disk or Repair Disk operation and the system finished booting with no apparent loss of data. Having data backups reduces the mental stress of wondering if a day's worth of data will be recoverable.