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Exporting a theme is very useful when you want either to back the theme up for safety, and create an archive of the theme for a friend or in order to make it available on the Addons marketplace (http://addons.prestashop.com/). Not only does it generate a complete Zip archive of your theme, but it also adds many information in an XML files, which is very useful both when uploading to Addons, and when important importing to another PrestaShop site.
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