Abstract: Disclosed is a method of controlling backup data by using a snapshot type image table, the method including: assigning a snapshot table area; storing as first snapshot information a data size, a position address, and a time of data of the hard disk in the snapshot table area; storing as second snapshot information a data size designated from a data size of the first snapshot information, a position address, and a time of the added or removed data; respectively displaying and recording unique names, and data sizes and storage times, and displaying in a searchable list; and removing a connection to removed data, and maintaining a connection to added data. Accordingly, the method recovers and protects unexpected damaged data by assigning a snapshot table area with a minimum, and structurizing and recording in advance an address and a property of stored data.