You can quickly export lists of Users and Accounts to CSV or JSON format within the Hull dashboard.
To do this, simply view the segment of users or accounts that you wish to export, and click the "Send to" button. Choose the format that you require, and select the corresponding export button.
You will be asked to enter an email address for the list to be sent to. You should receive the file within a few minutes - be sure to check your spam filter if you're unable to find it.