DFSR Migration across different AD Forests

Hi,

I am looking for some expert (from the field) thoughts on how to approach migration of DFSR data across 2 different AD Forests.

SCENARIO

Company A has acquired Company B. Company B has 500 GB of DFSR data which needs to be migrated across onto the DFSR Infrastructure of Company A. 2 Way Forest Level Trust already exists between both the companies.

Thanks

HA