How to Easily backup the Thunderbird email with the attachments on Mac OS?
It is always a good move to have a backup of emails on the hard drive because if in case you accidentally delete the emails from the server then you will already have a backup. On the other hand, attacks by hackers and viruses can also damage the file in which all the emails and mailbox items are stored. Therefore, having a backup of all the emails is a better choice to make. Many Mac users face problems when they backup Thunderbird emails with attachments on an external hard drive on their mac devices. So, in this article, we will show you different methods to download all Thunderbird emails to an external hard drive on a Mac machine.
read more:- https://www.macsonik.com/blog/backup-thunderbird-emails-to-hard-drive-on-mac/

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Sanchit Tandon commented
To manually backup Thunderbird emails with attachments on Mac OS, copy the profile folder (found in ~/Library/Thunderbird/Profiles/) to a secure location. This process is manual, slow, and error-prone, lacks automation, and doesn’t support selective backups. CloudMigration Thunderbird Backup Tool offers a one-click solution, ensures fast and secure backups, allows selective email and attachment backup, maintains data integrity, and supports easy migration to other platforms or cloud storage.