Which of the following is correct about the understanding of backup and disaster recovery?

Which of the following is correct about the understanding of backup and disaster recovery?
A . Data backup needs to put production storage and backup storage in the same room
B . Data can be placed in different areas to achieve disaster tolerance
C . As long as data transmission, data storage and data exchange occur, data failure may occur, which in turn affects the use of services. Therefore, data backup is required to ensure data security.
D . Disaster recovery or backup can ensure that data will not be lost

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Answer: C