What is the 3-2-1 rule for backing up your data?
Make sure your files are safe in the event of a hard drive disaster.
Understanding Data Loss
Whether it's photos, videos, financial records or personal documents, you've probably generated plenty of data over the years. Taking the time to make sure all that data is safe and backed up prevents the panic that comes from realizing your important files are gone for good. One fried hard drive doesn't have to leave you stranded.
While there are different approaches out there to backing up your data, there's a classic rule you can use to get started. The 3-2-1 rule is a framework that covers how many copies of your data you need across how many types of media, and where that media should live. That way, if something happens to one of your copies, you have others you can rely on.
The Core Principles
The 3-2-1 rule was first popularized by photographer Peter Krogh in his 2009 book, The DAM Book: Digital Asset Management for Photographers. At a baseline, the rule says that you need three copies of your data stored on two types of media, and that one of those should be kept offsite. If you only have one copy stored on an SSD and something happens to that SSD, you are out of luck. Even if you make copies to multiple drives, you could still lose everything in a disaster like a flood, house fire or burglary. Keeping an offsite copy provides another layer of protection.
Modern Implementation
Over the years, the 3-2-1 rule has evolved as both technology and the threats against it have changed. People tend to interpret the 3-2-1 rule to fit their specific needs and what is feasible for them, as personal data protection requirements differ significantly from those of large enterprises.
For example, you might keep files on your laptop, an external hard drive and a private cloud server. You might also use a service like iCloud or Google Cloud, though it should be noted that depending on the service and syncing settings, deleting a file from your computer might also delete it from the cloud. Other services offer automatic full backups of your devices with various storage limitations and pricing tiers.
Additionally, modern developments have changed how the 3-2-1 rule is used, particularly regarding the cybersecurity landscape. For instance, an offsite copy can still be vulnerable to a ransomware attack if the device remains networked.
Conclusion
Though backing up your data might seem tedious, the 3-2-1 rule is a straightforward way to think about preserving important files. Taking a few steps to make copies and keeping those copies in different locations can make the difference between a full-blown crisis and complete peace of mind.
