Replace Avamar node

Hello all,

this is my "as-is":

two sites, Avamar+DD on every site, cross replication from the 2 sites.

The Avamar nodes will be replaced by newer (from Gen4S to Gen4T).

there is a way to export metadata, dataset, schedule, retention policy?

Maybe root-to-root replication? How it work and and what are the operational steps?

Thanks in advance for your answers