If you want to do a full mailbox backup, using an email client or professional AOL backup software is highly recommended. The manual saving method is suitable for individual emails only. Choose the method that fits your needs best and ensure your AOL emails are always safe and accessible—even without internet. I will recommend you try the
Migrate Cloud Data AOL Mail Backup Tool that offers A complete Solution that Efficiently Migrates AOL Mail into Different File Formats (PDF, PST, MBOX, TXT, CSV, HTML, EML, etc.) and Email Clients (Office 365, Gmail, Yahoo, Thunderbird, Hotmail, GoDaddy Mail, Amazon Webmail, etc.).