When activating the pre-order page for your project you can add your Google Analytics ID to easily track where the backer accessed the pre-order link. Adding a tag (UTM parameter) to your pre-order url will now carry through the survey. Using Google Analytics will allow you to track referrals and purchases, among much more. Click here for help with using Google Analytics.
How to add your Google Analtytics ID:
Click on 'Settings' found on the left menu.
2) Add ID.
Within the project settings, enter your assigned Google Analytics ID.
3) Save Settings.
Click 'Save Settings' found in the upper right corner.