The 3-2-1 rule entails having three copies of essential data, utilizing two mediums of storage, and ensuring that one of the copies is stored at a remote location. It is intended to provide redundancy so that failure will not result in the destruction of all copies of your data. This can be done by storing your files in your computer, backing up in an external hard drive, and saving another copy in the cloud. The remote copy offers extra security just in case there is a robbery, fire, flooding, or ransomware at your office or home.