What is data backup ? why is it required? Write about online backup ??

In information technology, a backup, or data backup is a copy of computer data taken and stored elsewhere so that it may be used to restore the original after a data loss event. The verb form, referring to the process of doing so, is "back up", whereas the noun and adjective form is "backupThe purpose of the backup is to create a copy of data that can be recovered in the event of a primary data failure. Primary data failures can be the result of hardware or software failure, data corruption, or a human-caused event, such as a malicious attack (virus or malware), or accidental deletion of dataAn online backup is when your data is copied to an “off-site' or cloud storage solution. Services will consistently and securely store copies of your data to the cloud, so your data is accessible anytime you get online. An online backup is an integral part of a business' disaster recovery plan.

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