NetWorker integrates with VMWare much like Avamar. It will do guest-based backup with agents installed in the guest VMs for which the VM needs to be powered on. It will also do image-level backup using VADP using a proxy client that takes a snapshot, mounts the snap and backs up the snapshot. This reduces overhead on the ESXi host. Also, like with Avamar, CBT can be used to backup only changed blocks of data in the VMDK files. Individual file restore from VMDK can take place only on NTFS volumes.