As a VADP compliant application, Veeam Backup & Replication leverages VDDK libraries to interact with VMware vSphere environments to request VM snapshots, extract data from ESXi, and other operations. Depending on the version you are using, you are effectively running different versions of VDDK. Sometimes it’s important to know which one, to be sure if an unexpected behaviour is a known issues of that version or not.