Names like Locky and CryptoLocker are familiar due to numerous news reports, but if you haven’t heard of the growing threat of ransomware, here’s a quick summary: Ransomware is a type of malware that locks you out of your devices by encrypting your files. In return for access with the decryption key, it demands a payment, typically in bitcoin. In many cases, victims of ransomware cannot recover their files, so a backup is essential.