Remote Data Backups protects you from ransomware by automatically vaulting your data in read only format offsite. If you use a local backup, it will just encrypt your encrypted backup, thus making it useless. If you use cloud data services like Drop Box, OneDrive, Google docs, etc, it will infect and encrypt the data on ALL of the computers. You need a data vaulting service like Remote Data Backups to protect you from these types of attacks. You have all seen them in your inbox…FedEx package pickup notices, IRS emails, Nigerian General emails, etc….
http://www.reuters.com/article/us-cyber-ransom-idUSKBN17S1U6