What does the 3-2-1 backup rule entail?

• A. Three backup copies, two different media types, one off-site
• B. Three different versions of the same file
• C. Two backup types, three media types, one cloud
• D. Two servers, one copy each

Answer: (A)

The 3-2-1 backup rule is a well-recognized strategy for ensuring data redundancy and protection against data loss. This rule emphasizes the importance of having three copies of your data, consisting of the original data and two backups. It specifies using two different types of media for these backups to minimize the risk associated with hardware failure or corruption, and it stresses the importance of storing one copy off-site. This off-site storage protects data against localized disasters, such as fire or flooding, that could affect the primary site.

By following the 3-2-1 rule, individuals and organizations can significantly increase their data safety by diversifying storage locations and media types, thus ensuring better availability and recoverability of critical information when needed.