This tutorial covers all of the options you have BEFORE your eCard is sent including changing the eCard design, composing your message and managing your address list. You can access your saved eCards by going to eCards > Saved/Scheduled eCards. All of your saved and scheduled eCards show by default but you can search by date range, show just eCards that have an invitation and/or survey and more.
Your eCards are saved up to the last time you hit the 'Save' button while creating your eCard. As with any document you are working on, it is important to save often so you don't lose your work.