Networker 18.2 - delete old saveset from storage volume

Hi to everyone,

I have Networker infrastructure 18.2 on Windows server 2012r2  and backup on DataDomain DD2500.
On that storage there're 2 volumes.
The warning message on storage web-console is: Space usage has exceeded 90% of the total capacity.
Please, I need asap to delete some oldest saveset, because I see these on networker console, and to save space on storage volume.
At the end, I want to review the policy backup.
Which are the correct steps and command to use?
I seen nsrmm -d -S savesetID , but I think right to delete only to db and not on Datadomain
And I seen nsrstage -C -V , but sincerally I'm little bit confuse
Thanks in advance
Don