What is the file extension for NDMP backup CAB (Cluster Aware Backup extension) 07/26/2017 – by Mod_GuideK 0 What is the file extension for NDMP backup CAB (Cluster Aware Backup extension) A. CAB B. BAC C. CAP D. NDBC SHOW ANSWERSCorrect Answer: A Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.