Welcome Wilosh,
You can create separate projects for separate members. Here is an example. In this project, only Anita and John are involved. The other team members will have no rights to access it.
And yes, you can export online diagrams to various image formats: PNG, JPG, SVG, PDF
If you do not have an account yet, you can sign up here:
Feel free to let us know if you have any questions.
Best regards,
Jick Yeung
