This is a bad decision, Renee. Not to put too fine point on it, Facebook is useless for research and nearly useless for serious discussion. It's unclear why this forum is "a security risk." What's at risk? User names? The Facebook group suffers the same "risk." IIRC Facebook has been hacked several times.
No one is asking you to "move the forum" or to risk losing data. We only ask that you continue the bulletin board and open a new sub-forum for RM8.
Finally, it's coherent discussion, not screen shots, that are the virtue of a forum like this one. The most expert help from amongst your community is found here. IMO RootsMagic is making a big mistake.