You can export your site settings as an XML file that you can later import into Dreamweaver. Exporting/importing sites enables you to transfer site settings to other machines and product versions, share site settings with other users, and back up site settings.
The import/export feature does not import or export site files. It only imports/exports site settings to save you the time of recreating sites in Dreamweaver. For information on creating a new site in Dreamweaver, see Set up a local version of your site.
Export your site settings regularly so that you have a backup copy if anything happens to the site.