I'd like to complete answering the original post by explaining how easy it is to back up Thunderbird.
Open Dolphin and do Alt+. this will show the hidden files and directories.
Now find .thunderbird directory and copy it to your back up drive.
Done.
Open Dolphin and do Alt+. this will show the hidden files and directories.
Now find .thunderbird directory and copy it to your back up drive.
Done.
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