Attention for security now more needed than ever.

Security is a major consideration for any computer system. Today the topic security is defined and divided in three different domains: confidentiality, integrity and availability. This paper deals with the topic availability and the fact that hospitals are getting more and more dependent of their computer systems In this contribution the different aspects of availability and non-availability are described and measures are mentioned to lower the risk of dysfunction in the hospital in case the system completely has collapsed for a longer period.