MacSonik Yahoo Mail Backup Tool is one of the most popular Yahoo backup solutions that backup Yahoo email on macOS. This Yahoo backup tool for Mac saves Yahoo mailboxes into OST, MBOX, EML, EMLX, MSG, PST, CSV, HTML, MHTML, PDF, TXT, etc. Also, it exports emails from Yahoo Mail into other email clients such as Hotmail, Office 365, Live Exchange, AOL, IMAP Server, AWS, Thunderbird, iCloud, Yandex Mail, OperaMail, and other email clients on macOS. The apps supporting Mac versions are 10.15 Catalina, 10.14 Mojave, 10.13 High Sierra, 10.12 Sierra, OS X 10.11 El Capitan, 10.10 Yosemite, 10.9 Mavericks, and 10.8 Mountain Lion.