First, head to the Strategies tab.

Find the strategy you want to duplicate. Click the ellipsis ( ... ) -> Duplicate.

Here, you may also open the Strategy Builder (Edit), and delete a strategy from Aura.

Next, confirm Duplication on the pop-up

This will duplicate the selected strategy.

The new strategy titled "[Strategy Name] - Copy" will now be editable.

Click the ellipsis at the top of the page to rename the new strategy.