The Institute for Backup Trauma
The Institute for Backup Trauma starring John Cleese nicely illustrates some of the basic problems we encounter. And does so very, very well. Although I haven't seen a failure rate of tape backups as high as 50%.
There was just a short story in the newspaper about a woman who left her purse in a hospital washroom after changing the baby's diaper. Stolen from her purse was cash, digital camera and memory stick containing the only copies of photo's of the first month of her baby.