The customer shall not provide his/her personal access data (password) to third parties and shall protect this information to prevent access by third parties. Personal access data must be changed at regular intervals for security reasons. If there is any reason to assume that unauthorised people have obtained knowledge of the access data, then the customer must change this immediately. Personal access data may only be saved on data storage devices (hard disk, USB stick, CD-ROM, etc.) in encrypted form. </li> <li> The customer must backup their data in a suitable way at regular intervals to ensure that it may be recovered with a reasonable amount of effort. </li>