You can change your default credit card through your Carbonite account.
For your security, updates to existing credit cards can only be made by adding a new credit card.Carbonite Plans | Products | Platforms |
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The new credit card is now the default card for renewals and purchases. Subscriptions will automatically renew with the default credit card on the expiration date unless automatic renewal is turned off.
If the card you want to use appears within the Credit cards tab, click Make this the default credit card to set it as the default.
NOTE: You may see a temporary charge of $1.00 that will be refunded back to your bank within 7-10 Business Days. This is only a test transaction that Carbonite does not collect, it is used to verify the account information is correct.