Credit card information cannot be deleted from the Linode backend account unless you cancel your own account. However, you can update your credit card number and get a scrap card, which may serve your "insurance" purpose...

When you want to renew, you can use the credit card information Just update it, but I think this method is too troublesome, not to mention the credit problem of foreigners, it is more reliable, there is no need to go through all the troubles~~