Click on 'Export Data' under the 'My Site' heading on the Control Panel menu. Choose the export type, which data to include, and the file format. Then, click 'Export File.'
'Subscribers' are people who have opted-in to your mailing lists.
Click the link that appears below the 'Export File' button to download the file.
Once a file has been created, it is available in the 'Archive' tab for 60 days. Choose the export type, then click 'Archive.'