Definition – What does Backup mean?
Backup is a process of making multiple copies of data to use in the event the original data files are lost or destroyed. It may also refer to making copies for historical purposes such as longitudinal studies, studies or to meet the requirements of the data retention policy. Today most of the applications especially in Windows, produce backup files by using the .BAK file extension.
Glossary Web explains Backup
Not all the backup systems or application are capable of entirely restoring a computer system or other difficult system configurations such as a database server, active directory servers, and computer cluster. Managing a backup process is a complicated process, the unstructured backup may simply consist of a stack of CDs, DVDs or floppy disk. However, it is obvious that the security and ease of data recovery are both severely compromised.
Full and incremental backups begin with all data being backed up. Then, only new and modified data or data files are backed up, a much smaller segment of all data. Restoring the complete system to the data state at the specific point in the time would require the full system backup plus all the incremental backups to that point in time. The full system backup enables the computer system to be restored as it was at a given point in time such as the operating system, all programs, and all data. It creates a complete image of the computer then the user may reconstruct any data changes after that point in time.