You can easily export data from Spring Metrics into a CSV file. As of now, you can export data from the Reports tab.
On the Reports tab, there are three sub-tabs: Sources, Keywords, and Landing Pages. On each of those sub-tabs, there is a simple button titled "Export to CSV". Set the date range you'd like to export the data for, and just click the "Export to CSV" button.
Your file download will begin immediately. Here is a sample shot of some Sources data (Keyword and Landing Page data will be formatted similarly):