ESET has gone to great pains to point out that ransomware is still one of the largest threats to people's data online. It advises that everyone should keep their operating system updated and use a good anti-virus, as well as making regular backups of anything they wouldn't want to lose. There's also the question as to why TeslaCrypt's developers were so willing to hand over the keys, but let's hope that they decided to do the right thing. The alternative is just too horrible to contemplate.