In Huawei BCManager eBackup, what are the advantages of snapshot comparison technology compared to CBT technology?

In Huawei BCManager eBackup, what are the advantages of snapshot comparison technology compared to CBT technology?
A . Smaller space occupied by the production side
B . Support backup of virtual machines using Huawei distributed storage
C . The production side can save snapshots and protect data better.
D . Longer time to get data change information

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Answer: B