Just raising awareness of a new whitepaper from Symantec Security Response:
REPORT: Organizations must respond to increasing threat of ransomware https://www.symantec.com/connect/blogs/report-organizations-must-respond-increasing-threat-ransomware
Ransomware can be incredibly destructive. Please take time to read this report, then take any measures possible to reduce the risk of a successful ransomware attack against your network and data!