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What is a recommendation to reduce the network utilization and backup time while minimizing cost?

A customer has a large backup environment using EMC NetWorker integrated with Data Domain.
They have a requirement to backup their hosts every night. They start all of their host backups at
the same time. Each night during backups, their network utilization is high and the backups take a
long time.
What is a recommendation to reduce the network utilization and backup time while minimizing
cost?

What is the minimum number of pools required to have a successful NDMP backup?

A customer has an EMC VNX series NAS with total of 20 TB of user data. The customer wants to
use EMC NetWorker to backup the VNX to a Data Domain VTL. The VTL is configured with four
tape drives. Two drives are zoned to the backup server and two drives are zoned to the VNX.
What is the minimum number of pools required to have a successful NDMP backup?