Need a data which shows the name of the repeat customer and total purchase made by her/him in Magento backend.
You can use magento's report to get all data of customer. Number of order by customer and total spent of customer. You can also get information what they have in cart now. your sell for current month etc.
You need to goto in admin panel. You can see
Reports menu wwhere you can find all related report. for customer data you need to check
See below screenshot