If your site is unreachable, while a long period of time, reduce May the Google ranking of your site.
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I leader Google published under a Creative Commons to others to copy, distribute and working out if they Nancy Blachman credit and a link to Google Guide.

If most of your site’s content is commercially – for example, the pages for your company – consider other sites with useful information for the public. For example, if you have bicycles, or blog pages on the bike paths, cycling machines with recommending or on a bicycle. To make known and the other for the connection with them.
On your Web site into foreign languages.