1. Export your data to LDIF using `slapcat` https://www.openldap.org/software/man.cgi?query=slapcat
2. Install Debian 11 with OpenLDAP on some test machine 3. import LDIF using `ldapadd` or `ldapmodify` and see if it works https://www.digitalocean.com/community/tutorials/how-to-use-ldif-files-to-make-changes-to-an-openldap-system The most safe approach imho.
