In order to send data in email, you can use the send email submit action.If data needs to be stored in crx, one option is to use forms portal and that needs to be enabled when configuring form submission. It stores form data under "/content/forms/draftsandsubmissions/". Please find the documentation...

The submitted form data is not stored in JCR unless the submit action is invoke AEM workflow. In invoke AEM workflow, we can store the form data under the workflow payload or in a workflow variable(again persisted in JCR or externalized if workflow is configured to do that).In the case of send email...