Currently running on OES2 SP2a server. NSM version

Need to upgrade to new server. New server is OES11 SP1. Also would like to upgrade to latest NSM version.

Do I need to upgrade in place now and then move to new server? Can OES2 SP2a even run NSM 3.1?

Looked at documentation some, but don't see clear process on moving NSM to new server.
I didn't find any tips in the Discussion forum.
You've given me tips in the past and they have always worked great.

Can you point me to documentation and give best practices in making this upgrade and change.

Any assistance is greatly appreciated.