Which type of backup networking's working process is like the following:

1. A snapshot volume is created for a data volume that you want to back up.

2. The backup server backs up the data on the snapshot volume to the backup device.

The peak write bandwidth of an application is 10 MB/s, the average write bandwidth is 200 KB/s, and the average write 10 size is 4 KB. The overhead of private information is about 11%, and the bandwidth utilization rate is 70%. The network employs FC, and the synchronous remote replication mode (considering the overhead of private information) is enabled. Then, which is the required network bandwidth?

Which are possible causes for an enterprise to use virtual tape libraries as the backup media? (Multiple Choice)