According to your Planning Guide you must now make sure all pieces come together.
Make sure your IT-organization backups among many other systems also your Nodinite instance.
You should use the Nodinite Database Monitoring Agent to make sure backups are taken regardless of who is responsible. In the end, if the IT-department fails to backup your environment and it gets lost, it will be your problem!
Hardening the Web Client and other Core Services is a concept we documented on the How to perform hardening on your Nodinite installation
Make sure to stay updated both due to new features constantly being added to Nodinite but we also add security related features as technologies advance.