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If you downgraded then you would lose any Silver related ability to publish it this way. The file would still remain so that if you resume Silver then it should spring back to life. if you maintained the Silver hosting and unpublished the site to your custom domain the file would remain unchanged and you could even publish to a free yolasite sub-domain with all intact.
You would really only be moving your domain and not your site because that is impossible with Yola. Yola built sites are not portable out (or in).