You can access all your old invoices and edit your billing history at any time by clicking the "Account" button in your SpiderOak application, then choosing "Edit" next to "Credit Card/Billing Information." This will launch a secure window in your browser where you can access and print all your past invoices, update your credit card information, or change your billing address.
You can also access this information online by choosing the "Account" tab, then clicking Edit next to Credit Card/Billing Address. This will take you to your billing page where you can edit your personal information. You can also view and print any invoices on this account by clicking the "Receipt" button next to your dated invoice.