If a user requests that you erase all of the information that can personally identify her or him from your website. The user may request this via email or other means. You can apply this procedure both to frontend and backend users.
In order to achieve this, you need to delete certain data from the database – either entire records from a table, or particular columns only. Afterwards, you delete the user.
This whitepaper provides guidance about deleting personally identifiable information (PII) about a user from Sitefinity CMS.