From ADA News: Some good advice in light of the WannaCry mass ransomware attack over the weekend.
Backup your data regularly and keep a copy off-site: Backing up your data regularly and keeping a secured copy offsite can help protect you from ransomware, and would also be useful in the case of a disaster like fire or flood.
Be wary of email attachments: Opening attachments or clicking on web links from unknown sources is what many hackers are relying on to infiltrate your system. If you are not absolutely sure of the sender or the attachment, don’t open it. Better safe than sorry.
Maintain your cyber defenses: Make sure your anti-virus and anti-malware software is updated on a daily basis. Apply software patches for operating system, browser, and browser add-ins like Flash and Java as soon as they are available.