If a user wants to regularly back up the data on the cloud hard disk mounted on the cloud server, which method is the most efficient?

If a user wants to regularly back up the data on the cloud hard disk mounted on the cloud server, which method is the most efficient?
A . Set up a cloud disk automatic backup policy and make it effective on the cloud disk that needs to be backed up
B . Set the cloud disk automatic mirroring strategy and make it effective on the cloud disk that needs to be backed up
C . Ask the operation and maintenance personnel to regularly create images
D . Ask the operation and maintenance personnel to take snapshots regularly

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Answer: A