The act of copying files and databases to protect them in the event of a system failure or similar catastrophe and retrieving them at a later date.
The process of copying files so that they are preserved in the case of equipment failure or catastrophe. If files are damaged on the server, we resort to the backup copy to restore the files back to the machine.
A two step process. Information is first copied to non-volatile disk or tape media. In the event of computer problems (such as disk drive failures, power outages, or virus infection) resulting in data loss or damage to the original data, the copy is subsequently retrieved and restored to a functional system.
Data gets backed up on a regular basis from disk to tape. But if some one needs a file that was deleted accidentally it needs to be restored from tape to disk
The procedure of making backup copies of computer files or disks and, in case of loss of or damage to the original, using the backups to restore the files or disks. In such a case, the only work lost is that done since the backup was made.