Backup or the process of backing up refer to making copies of data so that these additional copies may be used to restore the original after a data loss event. These additional copies are typically called "backups." Backups are useful primarily to restore a state following a disaster and to restore small numbers of files after they have been accidentally deleted or corrupted. Data loss is also very common. You can backup your data via harware devices like external hard drives but there's no assurance your files will be safe in case of calamities like flood. online backup seems to be gaininmg popularity these days since it's much more practical.
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