BuddyPress.org

You can do it simply by backing up the database through a plugin. Once the data is backed up you can simply import that data into your new website. It won’t lose your ranking or UI/UX.

OK. I’ve never created a track ticket before, so I hope I’ve done this right:
https://buddypress.trac.wordpress.org/ticket/8676

@shanebp – Just to summarize, I did everything you suggested, including 2020 and BP Nouveau. I still get the DB error. See comment above.