In My Account "Payment Methods" section, you can manage your chosen payment options. To view or edit them, simply click the "View/edit Payment Methods" button.
A smaller window will appear, allowing you to manage your payment methods.
This is where you could add a recommended backup credit card. If your primary/current card payment fails, the secondary/backup card will be charged automatically.
If your primary credit card is approaching its expiration date, Everymail.com will send you email reminders to change credit card before the next subscription period begins.