Dedup showing 0% savings

Hi Everyone,
I enabled dedup on a backup drives used for SQL server backups and left it a couple of days. When I check the folder properties it has the following proeprties:
Size: 418GB
Size on Disk : 140GB
But overall usage on the drive as reported by My Computer has not gone down. File services reports 0% saving.
PS C:\Windows\system32> Get-DedupStatus Y:
FreeSpace    SavedSpace   OptimizedFiles     InPolicyFiles      Volume
13.02 GB     0 B          117                134                Y:
Any ideas?

Please view the post above:
PS C:\Windows\system32> Get-DedupStatus
FreeSpace    SavedSpace   OptimizedFiles     InPolicyFiles      Volume
18.38 GB     0 B          143            
   143                Y:
Sorry, extended information I mean. 
Get-DedupStatus |fl
(detailed info)
Also run Get-DudupVolume (w/o parameters) to see "SavedSpace" and "SavingsRate".
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

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