Backup

Backup

Backup: An additional copy of data or information stored on secondary storage media is called the back up data. In information technology, a backup, or the process of backing up, refers to the copying and archiving of computer data so it may be used to restore the original after a data loss event. The verb form is to back up in two words, whereas the noun is backup The common media for backup are zip disks, magnetic tape, floppy disk, CD-ROM and hard disk etc.

Types of backup:

Full backup:Back up all data on the hard disk is called complete backup or full backup. The advantage of this back up is that the entire hard disk is backed up. The data can be restored from this backup case of a problem in system.

Incremental backups: Incremental backup create a copy of only the data that is newly create or modified since the last backup. This process is preformat automatically in some software. In this type of backup the entire disk is not copy. It takes less time and space then complete backup.



 Differential backups:A differential backup is similar to an incremental backup in that it starts with a full backup, and subsequent backups only contain data that has changed. The difference is that while an incremental backup only includes the data that has changed since the previous backup, a differential backup contains all of the data that has changed since the last full backup.


Backup

Backups purposes:

The primary purpose:

To recover data after its loss, be it by data deletion or corruption. Data loss can be a common experience of computer users  found that 90% of respondents had lost files on their home PC.

The secondary purpose:

To recover data from an earlier time, according to a user-defined data retention policy, typically configured within a backup application for how long copies of data are required. Though backups represent a simple form of disaster recovery, and should be part of any disaster recovery plan.
Backup
 

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