In a computer, storage is the place where data is held in an electromagnetic form for access by a computer processor. In a proper usage, storage has been divided into:
(1) Primary storage or Main storage: - In this storage data is stored for quick access by the computer’s processor. Today’s in personnel computers RAM (Random access memory) are used as primary or main storage.
(2) Secondary storage or Auxiliary storage: - which holds data until it is deleted or overwritten. For example: – hard disks, tapes, and other devices used for input/output operations.
Primary storage is much faster to access than secondary storage. On the other hand, secondary storage can hold much more data than primary storage. There is an additional meaning for primary storage that distinguishes actively used storage from backup.
In computers, backup is a copy of the storage that is in use, backup data to protect against the data loss. Data loss can be of several reasons:-
1) Hardware failure
5) Fire/Act of god
If the storage medium such as a hard disk fails and data is lost on that medium, it can be recovered from the copy. In an enterprise the loss of data can be confidential. So, it is important that backup be provided. The secondary storage devices are used for the backup of the storage. In backup the copy of storage systems and the actual data still resides on the storage systems. In case, if backup system suffers an accidental loss, your operation could still continue normally since you can recover the data from backup.Tags: