Data backup is so important. Backup does exactly what it says is backed up with valuable information, it is not lost. Copies of data are such that it can in case of loss of data, copies of original data.
The issue of data loss has been catapulted into the public aware of concerns on numerous occasions in recent years. In 2008, an officer of accidental loss of records, the top-secret, and letting the latest findings of the British government of Al-Qaeda, containing a train. Cue public panic.