Thanks for your inquiry.
s2Member does not create any new SQL tables in your database, but instead uses the default WordPress tables wp_users and wp_usermeta to store user information.
If you’d like to export user data via Cron Job every 24 hours, you would need to get the information from the wp_users and wp_usermeta table. Some specific rows that s2Member puts into the usermeta table are:
wp_s2member_paid_registration_times
wp_s2member_subscr_gateway
wp_s2member_login_counter
wp_s2member_registration_ip
s2member_file_download_access_log
Please let us know if you have any more questions / concerns.