Concerning big save sets: NW needs to keep track about the 'segment's location 
and sequence. It is not possible to spread a single save set's data over 
multiple media simultaneously. This is obvious as NetWorker could theoretically 
split such save set and start with 'segment_x' on tape_2. However, it would not 
know in advance whether all data up to 'segment_x-1' would be successfully 
written on tape_1. 

I am pretty sure that NetWorker can not even spread multiple small save sets 
from the GUI to different media. But it might do so if the other parameters fit 
as well (small Target Session value for the tape drives etc). 

Best practice i would use is to run multiple nsrclone commands/scripts for this 
purpose.
Using the command line you can of course also clone directly to multiple clone 
pools which the GUI does not offer you (unfortunately this is rarely an option).

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