You can use Yota Email Backup Wizard which is the best and most reliable software to backup your emails. It allows you to create Gmail backup, Office 365 backup, Yahoo Mail, Outlook.com, and any IMAP-based email accounts. You can export your account emails in PDF, PST, EML, MBOX, and other file formats on your system. The software provides an option to transfer emails from one account to another directly.
Features of Best Email Backup Software