The best defense is actually a good backup system. Modern ones can make snapshots every 10 min or something like that. Allowing blackmail to happen is probably a bad decision as it supports the industry, which has a revenue of multiple million $.<p>Still surprised that dysfunctional networks prevented such an important operation though. Careful network segmenting could probably have prevented this, but it takes considerable IT resources that probably were not available.<p>That they killed the network of the hospital for a week is unacceptable and they say it will take a long time to restore it properly. I expect more investment in IT resources.<p>I couldn't find any mention about "add-on" software in German articles, maybe it is a translation error?