We are in the middle of upgrading our ArcGIS platform to 10.3.1. A decision was made to migrate to new server instance (as opposed to in place upgrade). Could anyone share thoughts on how best to migrate portal users and content from the old instance to the new instance? My concern is whether the PostgreSQL database structure (which I assume contains user:content mapping, group security, etc.) in 10.2 is identical to that of 10.3.1 or if I could simply port over the 'arcgisportal\content' folder without breaking existing mapping of users:content. Thanks in advance.