Back Up Thunderbird with MozBackup
If you were specifically looking for a Thunderbird backup utility, you might not be surprised to find that these are few and far between. However one tool that seems to perform the job admirably is MozBackup, available from mozbackup.jasnapaka.com/download.
Sadly only available for Windows (all versions from Windows 98 through to 7), MozBackup will create backups of emails, address books, passwords and certificates as well as general settings for Thunderbird, and can also be used to backup your Mozilla Firefox data as well.
This app is very easy to use. After downloading and installing, exit Thunderbird and launch MozBackup. You can then select to bacup or restore (useful for disaster recovery) and then select the Thunderbird version you are using, before clicking Next. In the following screen select the profile you want to backup and Browse... to change the default backup directory before clicking Next again.
You will then be asked if you want to set a password to protect the backup file. After this, you can then select the data types (emails, address books, etc.) that you wish to backup and then click Next to create the backup. Once complete, a summary will appear listing the contents of the backup, and you can exit MozBackup by clicking Finish.
Screenshot by author.