Backup refers to the copying of virtual files or databases to another storage device or system. The purpose of backups is to preserve the saved data.
In case of equipment failure, malicious code, computer criminals, user errors or other unforeseen events and catastrophes destroying the data, backups enable to restore the information to a previously saved state.
Backups capture and synchronize point-in-time snapshots and should be applied regularly to critical databases and business applications. How frequently backups should be created depends on the type of information to save, how fast they need to be restored, and the available space at the chosen backup media.
Business best practices suggest a full data backup to occur at least once a week, often during weekends or off-business hours. To supplement weekly full backups, enterprises typically schedule a series of differential or incremental data backup jobs that back up only data that has changed since the last full backup took place.