About incremental backups of virtual machines
NetBackup enables full virtual machine and file-level incrementals in the same backup (the option).
Better support for incremental backup is available when you use BLIB (Enable block-level incremental backup). BLIB requires ESX 4.x and virtual machines at vmx-07 or later.
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Individual file recovery is supported from full backups and from incremental backups, as long as the policy option is enabled.
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Make sure that the virtual machines to back up are time synchronized with the backup host. Otherwise, some changed data may not be included in the backup, depending on the clock differential between the backup host and the virtual machine.
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For incremental backups, you do not have to configure the client on the VMware backup host for timestamps. The VMware policies automatically default to the use of timestamps.