by Emma Richardson.
Try one course - it might just work. I am not totally sure on the backup and restore - I know that it looks at username and email. I would suspect it also looks at id but not sure. An import will quickly tell you as it will error out - you can always delete the course if you have issues.
If it errors, try this.
Remove the ldap users from the new system. Import the courses with users. Then, if necessary, switch the authentication method on the imported users to ldap. Run ldap sync. The users should then match up with the ldap system by username.