(Entry was posted by James Pybus on this post in the Dumb SEO Questions community on Facebook, 10/24/2019).

Full copy to sub domain - seems strange

This is new to me â€“ seems strange.The website development company have said as part of their migration process they will do a full copy of the site and add it to the sub domain in order to maintain backlinks and domain authority. Surely this is just duplicate content â€“ what do you think? I have been asked to take a look at the site and this sub domain (old website) has been running at the same time as the new site for the last 4 months. Am I missing something/going mad?

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YOUR ANSWERS

Selected answers from the Dumb SEO Questions Facebook & G+ community.

Mike Martino: Is it duplicate content? Or is the new website different to the old one?
James Pybus: only the primary pages are different over 500 pages are duplicated blog posts
Rituraj Shrivastava: they must have added canonical tags. Haven`t they?
James Pybus: Rituraj Shrivastava no nothing. I guess my question is really - is this now best practice?
Rituraj Shrivastava: As per the info you are providing it`s not good. They should have used the older urls in the new site and put the content there or used 301 on those urls to contain the link equity.
James Pybus: Rituraj Shrivastava yep, agreed, never seen this sub domain action before. Thanks for your input