We have website that was hit by penguin due to excessive bad links which was quite difficult to fix.
So we purchased a new domain and transferred old site there. To avoid duplicate content we disallowed the original site using robots.txt and removed the whole site through webmaster tools.
So my question is should we also remove the original site from server itself ?. Our management aren't ready to remove the original site. So would it still create some duplicate content issue despite that we have already deindexed the site through webmaster tools.