To use myCloud, you can simply activate myCloud free of charge for your Swisscom login.
If you do not have an existing Swisscom login, you can create a new Swisscom login here. Once you’ve entered in your login info, you’ll receive a confirmation email with a login code. You’ll need this code to confirm your email address. Once you’ve confirmed your email address, you’re done creating your myCloud account and can now backup any folders you choose.