Why backup: part 1

A data or a file or the entire file system or a service or the entire corporate network may be corrupted or no longer usable for several reasons:

• due to an error by an employee or operator;
• for software problems;
• why the file system got corrupted;
• for hardware problems;
• for a computer virus or for the intrusion of a hacker;
• for a structural disaster or a natural disaster.