The 3-2-1 rule is a data backup framework popularized by photographer Peter Krogh in 2009. It requires three copies of your data, stored on two different types of media, with one copy kept offsite. This redundancy protects against hardware failure, disasters like fire or flood, and ransomware.
For example, keep files on your laptop, an external drive, and a cloud service like iCloud or Google Cloud. Note that syncing services may delete files everywhere if accidentally removed. Modern interpretations adapt the rule to current tech and threats, ensuring your photos, documents, and memories remain safe.
Source: Engadget · Summarized by HeadlinesBriefing