Kernel IMAP Backup tool provide you an automatic solution to backup, you can take bulk backup with CSV. The software well supports all IMAP server like Yahoo, Gmail, G Suite, Amazon WorkMail, AOL, Zimbra, Outlook.com, Office365.com, Zoho Mail etc. and it comes with advance features, you can apply ‘Filters” option as well Incremental Backup. https://www.nucleustechnologies.com/imap-backup/