Migrate from 6.1.3 pro Ubuntu 16.04 to 6.3.1 community on FreeBSD

The title pretty much tells the story.

I’ve got seafile pro 6.1.3 on an ubuntu 16.04 box that will be decomissioned. I’m looking to install 6.3.1 or 6.3.2 on FreeBSD 11.1-RELEASE-p10

While I understand that FreeBSD is not fully supported, I have seen that the ports tree as the server v6.3.1 or 6.3.2 that I would like to migrate to. Setting this issue aside, and assuming that an install works, my question is how to migrate my users/data/libraries/history, etc.

Is the proper process to upgrade the existing install through all revisions, then migrate the necessary files from one server to another, or is there anything else that I need to do?