backing up ldap master dc=xxx,dc=domain,dc=country to other dc=yyy,…

Hello, I'd like to backup my ldap master dc=xxx 10.5.2 now to a new server with a different ldap dc=yyy. Backing up with server admin and importing to new server results in no error code, and no data in ldap. Is there a possibility to do this with tools or commandline ? I found nothing Mike