Documenting what I've done so far:
I backed up the /opt/tomcat/webapps directory, the Tanuki wrapper config for Tomcat (which I've modified) and the LDAP database.
I had to shut down Gluu to do the export, and then I ran **/opt/gluu-server-2.4.3/opt/opendj/bin/export-ldif** to actually create the LDIF file. Because I am still in the deployment/testing stage with Gluu, I only had one org, one client and one user, so I don't think I need to restore the entire database - just the client, org and user