What is the 3-2-1 rule for backing up your data?

The 3-2-1 backup rule is a foundational strategy for ensuring data integrity and protection against hardware failure or accidental loss. The methodology dictates that users should maintain at least three total copies of their data to minimize the risk of simultaneous failure. These copies should be stored on two different types of media, such as an internal hard drive and an external solid-state drive or network-attached storage. Finally, at least one of these copies must be kept in an off-site location, such as a cloud storage service or a separate physical facility, to protect against localized disasters like fire, theft, or natural catastrophes. By adhering to this simple framework, individuals and businesses can significantly improve their resilience against data loss, ensuring that critical files remain recoverable even if primary storage devices fail or become inaccessible due to unforeseen circumstances.