What is backup?

In terms of information technology, backup means to make copies of data. These additional copies may be used to restore the original if the data loss. We usually called these copies are "backups." Backups are useful primarily for two purposes. One is disaster recovery (restore a state following the disaster). Another is to restore files after they have been deleted or corrupted.

The data storage requirements are considerable, because a backup system contains at least one copy of all data worth saving. It is a complicated task to organize the storage space and manage the procedure of backup. As the development of technology, there are kinds of data storage mediums can help us to make backups and they can be arranged to provide geographic redundancy, data security and portability.

If you want to restore these data, you should select, extract, and manipulate these backups. We can also use many different techniques to optimize the backup procedure. These include optimizations for dealing with open files and live data sources as well as compression and de-duplication, among others. It is also important to recognize the limitations and human factors involved in any backup scheme.

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