I would recommend that you use the MailConverterTools Yahoo Backup Tool to back up Yahoo Mail. Using this software, users can save Yahoo Email to PDF, MBOX, EML, and other file formats. Additionally, it allows you to migrate Yahoo emails to Office 365, Gmail, Thunderbird, and more. The Yahoo Mail Backup Tool is safe and easy to use, ensuring accurate downloads of your Yahoo emails. The software is embedded with a Date Range Filter option that helps the user to export data based on the date range(Start Date and End Date) and categories like Email, Contacts, Calendar, Notes, etc.