Here is a quick reference sheet for Windows Server 2012 deduplication.
The Dedup feature is not installed by default
Dedup is a Server only feature
Dedup is not supported on:
- FAT volumes
- Boot or System Volumes
- Remote Drives
- Cluster Shared Volumes (supported on non CSV volumes on cluster)
- 3rd party file systems
skips the following file types:
- Encrypted Files
- Files with 'extended attributes'
- Files < 64KB in size, reparse points
- Dedup volumes can be backed up and restored optimized
NOTE: In Window 2012 R2 support is added for Cluster Shared Volumes.