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Hãy chỉ ra các lý do nên sao lưu dữ liệu dự phòngPhòng trường hợp bị mất cắp (1)Phòng trường hợp bị mất mát hệ thống do thiên tai, hỏa hoạn (2)Phòng trường hợp bị tấn công bởi hacker hoặc virus (3)Các phương án (1) - (2) - (3) đều đúng

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