In case you want to export customer data to from the system in order to store it within your company database, for example,
1. Click on the booking module
2. Click on clients
3. Choose either bookers or guests to export data for (in order to see the difference between booker and guest, see this article)
4. Click on the table columns icon
5. Choose the information you want to show in the list
6. Choose if you want to export as PDF file, Excel file or print the page
If you want to know how to add or modify customer data, see this article.