For orders, go to Orders then Export Orders, select the Default template or a custom one, choose CSV or XML as the file format, tick Save export to the server for later download, which writes the file to the exports folder in WebDAV and is recommended above 1000 orders, then click Continue then Start export, then Download my Orders file. A date range comes out by searching the orders first and clicking Export all, which takes every order in the result and not just the first page. For customers, go to Customers then All customers, tick the rows or take all of them, click Export selected customers, pick the Bulk Edit or Default template and CSV or XML, then click the Download link. The account needs Manage Orders and Export Orders for orders, Manage Customers and Export Customers for customers, and Manage Export Templates to edit a template. Only CSV can be read back in, and orders can only be imported through the API.
What it holds
Orders with line items, customer accounts and addresses, products, coupons.
Find the size
The control panel shows no storage figure and no order or customer total on the export screens. Quote the row count of the exported orders CSV and of the customers CSV, and the count the Orders list returns for the date range searched.
What to enter on the form
BigCommerce in records, and the year your company started using it. Seller form