Is there any software or tool to back up multiple email accounts one by one? Yes, the MailsDaddy Email Backup Tool supports backing up multiple accounts individually. You can log into Gmail, Outlook.com, Yahoo, Office 365, or any IMAP-supported service and export each mailbox in the format you prefer. It’s a reliable choice for users who manage multiple accounts and want a secure offline backup.
Vist here: https://www.mailsdaddy.com/email-backup-tool/