Would having two almost identical book stores on the same (sub)domain create duplicate contents problem? I will explain in more detail, so that I can receive a better answer.

Let's say I own a shop on a Mydomain.com (root location) and then I also have an older but also secure and almost identical shop.mydomain.com at the subdomain which is an older version but has the same identical goods and text descriptions in it. Thus:

mydomain.com

shop.mydomain.com

Why have I done that? The older shop has a lot of money invested in customizations and software etc and is like a back up in case if one shop fails I can keep on running a business instead of closing down for long lasting repairs.

Would that create Google's duplicate content penalty?

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