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How can I backup my Address list onto an external drive?

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I would like to save all my addresses onto an external drive. How do I do this?

I would like to save all my addresses onto an external drive. How do I do this?

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Open address book window Select Tools-Export Select file type and the location to save the file

Or backup your entire profile to save all your data. https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data