Assuming that the parallelism values are high enough, NW should do parallel 
packups. 
However, it might be that the single save set may be started as the last one. 

There is no real need to use a second group unless you want to 'group' and 
control the sequence anong these streams a little bit by using slightly 
different start times. But again - unless these clients are alone in a group, 
you will not be able to predict when they will start their backups.

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