Hello,
One of your option would be to run savegrp cmd with -c option to run one 
client at a time and schedule it via Control M or other scheduler, that 
way you can create job dependency and that would take care of one job 
finishing before other starting, the only thing i worry about is what if 
first job or second job takes way long or gets stuck , all other jobs can 
wait also.
One way to get around that would be scripts  savepnpc time-out values for 
each times and kill the stuck job at specified time interval ( leaves you 
with having to catchup again) but it could work most of the time.
This method allows you to keep your group\server config as is and benefit 
of achieving what you like.
HTH

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