Ransomware is malware that disables your computer data until you pay a fee. This is done by encrypting the files so they are unreadable. There is no way to access your files without the “key” held by the hacker. Obviously this is serious as it has the potential to render all user data useless. There is now ransomware targeting the Mac.
Paying the ransom is a bad idea. There is no guarantee the data will be unlocked and you encourage this behavior. MacLab’s cloud backup cannot be encrypted by ransomware and is excellent protection. Another recommended level of protection is to have a firewall with advanced threat detection such as Kerio Control. Lastly, be sure routine maintenance is performed to keep up with security patches.