Microsoft in security update 967723 introduced MPP (Memory Pressure Protection) (4044383)

Affected NV Version: 8.5
OS Version: Windows

What MPP does is watch the amount of RAM an application uses compared to TCP connection. If an application has a TCP connection and suddenly uses 90% of a systems ram (like SmartDisk Post Processing de-dupe) MPP will kill the application. This is intended to be a security feature.

More info here...
http://support.microsoft.com/kb/974288

The solution is to disable MPP so it allows NV backup and NV SmartDisk to work without any interruptions.

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