Hi Marshall,
It was removed as when we started building out ExpressionEngine 3, we discovered that the feature wasn’t working as intended or expected and was in some rare cases orphaning data. We found that it was an edge case feature not being used by a very large portion of our customer base, so the hard decision to remove it for 3 was made.
Currently there isn’t an alternate way to duplicate a site in MSM.
@James for the sake of simplicity. Over the years I have used MSM to both Extend EE and create stand alone sites. The power behind it is the single sign-on for multipule sites so one wouldn’t have to have a whole new single instance install.
So, in the past I’ve used it to clone over data/entries from production on to a dev site so we have some real data to mess with for future updates and found it a quick and dirty route to create a dev site that is a clone of a prod site.
EE 3 has Channel Sets so you can export it from site A and import it into site B. Copying templates is a breeze as well.
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