About cloud hard disk backup, which is the correct statement?

About cloud hard disk backup, which is the correct statement?
A . Cloud disk backup supports simultaneous multiple backups of the same cloud disk
B . You can use a backup batch to restore multiple hard drives
C . You can bind multiple cloud disks by use backup policies to back up in batches.
D . When you back up your cloud drive, you must shut down the cloud server

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Answer: C