Michael has some good points, but unless I've missed it, we know next to nothing about your site and method of backup.

Stabs in the dark:

Is the i/o path from vm to esx very short?

Have you tuned the NBU master/media servers?

Is your backup path independent of the network/normal i/o and disk i/o?

There are hundreds of other possibilities depending on your setup.

Cheers, Wayne

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