You can make a clone, which is an exact copy of the card in its current state, minus the guest list. Once the card has been cloned, the new draft will automatically be saved to the Drafts section of your Post Box.
To clone your card:
- Hover over your name at the top right corner of the homepage and choose "Post Box" when the menu appears
- Find the card you want to clone (unsent cards will appear in the "Drafts" tab)
- Hover over the arrow to the right, which will bring up the "Manage" menu. From here, you can click "Clone" to make a copy of your card.