Ransomware attack puts KQED in low-tech mode

[Lester]

All Internet-connected devices, tools and machinery have been cut off in an attempt to isolate and contain a ransomware attack that infected the station’s computers June 15. More than a month later, many remain offline.

http://www.sfchronicle.com/business/art ... 295175.php

How does one successfully create a "Battlestar Galactica" environment where your operational systems live completely free and independent of the less-secure, but necessary network you also require?