# 3-2-1 backup rule Topics: [[Backup]] The 3-2-1 rule, attributed to photographer Peter Krogh, follows these requirements: - **3 Copies of Data** – Maintain three copies of data — the original, and at least two copies. - **2 Different Media** – Use two different media types for storage. This can help reduce any impact that may be attributable to one specific storage media type. - **1 Copy Offsite** – Keep one copy offsite to prevent the possibility of data loss due to a site-specific failure such as theft or fire. ## Subtopics - ## Bookmarks - ## Related topics -