Deduplication is a mechanism to reduce the amount of data stored on disk for backup, archive or even primary storage.  For any storage, data is often duplicated and any system that eliminates storing duplicate data will be more utilize storage more efficiently.
Essentially, deduplication systems identify duplicate data and only store one copy of such data. [...]

Quantum announced today that they are OEMing esXpress software (from PHD Virtual) to better support VMware VM backups (see press release) . This software schedules VMware snapshots of VMs and can then transfer the VM snapshot (backup) data directly to a Quantum DXI storage device.
One free “Professional” esXpress license will ship with each DXI [...]

It’s unclear to me what EMC would want with Data Domain (DD) other than to lockup deduplication technology across the enterprise. EMC has Avamar for Source dedupe, has DL for target dedupe, has Celerra Dedupe and the only one’s missing are V-Max, Symm & Clariion dedupe.
My guess is that EMC sees Data Domain’s market [...]