Backup refers to the replication of documents or databases to be used in case of a disaster. Having copy duplicates of your most imperative information spared in an exceedingly remote space protects it on the off probability that something seems badly with your computer.
The purpose of the backup is to make a replica of the information that may be recovered within the event of a primary data failure. Primary knowledge failures may be the results of hardware or software system failure, knowledge corruption, or a human-caused event, like a malicious attack (virus or malware), or accidental deletion of knowledge.
Storing the copy of the information on separate medium is essential to shield against primary data loss or corruption. This extra medium may be as easy as a USB, or a disk storage system, or cloud based. The alternate medium may be within the same location because the primary knowledge or at a far offsite location.
For best results, backup copies ar created on a sregular basis to attenuate the quantity of knowledge lost between backups.