Depending on your license(s) NW will only allow a certain number of 
parallel/simulteanous save sessions. If you try to start more backup processes 
at a time you will receive this message. This should not be any problem as NW 
will just queue the streams and will start the next one when one has finished. 
It is just a reminder that you could open even more if you my the correct 
(storage node) licenses, even if you do not want to add another storage node at 
all.

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