If you are looking for the best IMAP Backup software, I suggest the MailsDaddy IMAP Backup Software. It’s really the most powerful and excellent solution for taking backup IMAP emails from IMAP accounts. By using this amazing software users can safely export their IMAP emails from IMAP server into PST, MBOX, HTML, MHTM, MSG, EML, RTF and other file formats.
It allows you to take backup IMAP emails from all IMAP-supported email clients such as Yahoo, Gmail, Thunderbird, Yandex, Hotmail, Zoho Mail, and others. This utility is compatible with every Windows edition including Win 11, 10, 8, 7, and all previous versions.
For more details visit here: Backup IMAP emails