Your data, photos, emails are very important. That is why we do backups.
To mark this very important step, today is World Backup 2012.
Go to World Backup Day for tips and instructions.
Windows comes with backup software and Apple Mac OSX comes with Time Machine. Although there are better backup software like Acronis or Paragon for Windows. Hard drives are cheap so everyone should do backups.
Just make sure the backups can restore. You might be diligent in doing a backup each day but sometimes the restores do not work when required at the crucial time.