Ransomware attackers specifically target and attempt to destroy backup systems to increase the probability of payment. Hardening your system is critical. Please ensure you have reviewed your platform security using the Security Hardening Checklist
About NDMP support for Replication Director — NetBackup 10.0 | Cohesity Documentation
NDMP can be used to back up, browse, and restore snapshots. The advantage to using Replication Director and creating a backup policy that uses NDMP is that NetBackup needs to mount only the primary data to perform these actions.