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In computer language, backup term means to copy files or data in a secondary medium as a precaution. So, the secondary medium can be easily used to restore the original data in the event of data loss. Backup process has two distinct purposes, which are as follows:

- To recover the data after its loss

- Recover the data from an earlier time

Data loss can be common experience for the users; where backup can be a very useful method to ensure the security of vital information or data. In more simple words, this facility represents a simple form of disaster recovery. Since backup system contains at least one copy of all data worth for saving for future reference, storage space requirements have also increased significantly.


1. Backup - Wikipedia, the free encyclopedia