Compared with object storage service OBS and elastic file service SFS, block storage service EVS mainly uses?

With the rapid development of the Internet industry, customer data is crucial to an enterprise. Data protection from attacks and rapid recovery after data failure have become important tasks considered by major cloud vendors.
HUAWEI CLOUD's cloud backup and recovery service, CBR, can provide data security services for which of the following scenarios? (Multiple choice)

Please match the following related components and functional characteristics of open source Kubernetes.

A large Internet company is planning to deploy a test environment on Huawei Cloud. The operation and maintenance director requires that when purchasing an elastic cloud server, in addition to the system disk, an additional data disk must be added, and the IOPS limit of the data disk must be higher than the upper limit. 2,220, the cloud disk with the lowest IOPS burst limit value higher than 6,500 and the lowest cost.
Which of the following descriptions about EVS types of cloud disks is most suitable? (Multiple choice)

Which of the following descriptions about data encryption services are correct? (Multiple choice)