Send them in an encrypted email to yourself!
Every email is encrypted, so you can send all types of confidential information and save them in your mail box and nobody, not even your email service provider can open any of the emails. It's safer than traditional cloud savings.
It is recommended that you create a separate folder in your mailbox for your confidential information email. At the same time, special attention should be paid that the certificate protection password must be set for your encrypting certificate, then even if somebody has hacked your mailbox and get your encrypted email, your confidential info will still be safe since nobody know your encrypting certificate protection password.