Navigate to the mart.

Select Admin and then Mart

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Select the tables you would like to export from the dropdown on the right. If you click on the first row, it will select all of the tables

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Click on the cross or menu down arrow to close the menu. The menu caption will indicate how many tables have been selected.

Press Request Export

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A zip file will be created containing the Mart

If you open it, you will see this structure

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If you go to the tables folder and then select a table name, you will see that there are scripts for both the table and the data

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The zip file can be loaded into another mart:

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