An operating method of a backup device includes displaying a window corresponding to a backup destination on a graphic user interface (GUI); under a condition that an add-into-backup-list command is received via the GUI, recording a first backup entry corresponding to backup target data by a backup list according to the add-into-backup-list command; after the first backup entry is recorded, displaying an icon corresponding to the first backup entry in the window corresponding to the backup destination; and under a condition that a start-backup command is received via the GUI, backing up the backup target data into the backup destination according to the start-backup command.