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A backup of an external hard drive will offer security for the stored data in the case of drive failure, corruption, or formatting of the original one. In order to make a backup of files on the external hard drive, plug the original drive and another drive into the computer. Open File Explorer or Finder, choose the needed folders and copy them to the new drive. After the process is done, you should safely eject any of the drives. If you have large amount of data, you should think about backup software with such features as scheduled copies and incremental backups. Another copy may be stored at another place. Notchox can be used when you need to recover lost files from supported media.