Back up your data. Or else!
Graham Cluley explains:
Ransomware ran amok in 2016.
Given ransomware's success, it's no surprise some developers of non-encrypting malware modified their software to begin asking victims for a ransom. The creators of KillDisk did it, and no doubt other criminals will follow suit.
To a certain extent, end-users wised up to (or at least became aware of) the ransomware threat in 2016, though for whatever reason, many chose not to create a data backup strategy. Maybe the task seemed too daunting. Maybe they just didn't have the time.