How can I export our tickets including all the ticket details such as comments or email addresses?
Depending on the type of account you have, there are different options to perform a full-ticket data export.
If you are an admin and have access to native export options or an agent with a custom role that allows exporting data, you can do a JSON or full XML export. For more information on exporting your data, see the article: Exporting data to a JSON, CSV, or XML file.
For related information, see this article: Can I export tickets when the view has filters?