Volume Deduplication

I have a virtual file server in my environment that has a drive filling up.  My usual process is to run WinDirStat to see what can be cleaned up before provisioning more storage. 

To my dismay - I found out that data dedupe is turned on for this volume!!  I can't actually see which users (this is a home directory share) are actually consuming the most data.  Is there anyway to tell when this was turned on and by who?  Is this ever auto enabled?

When I look in the server manager I see that there are "Deduplication Savings"; however, file explorer shows the disk at 80% capacity with "chunk store" taking up the majority of the actual space within a hidden System Volume Information folder.

I cloned the file server.  Next I disabled dedupe on the drive within server manager.  Next I ran the powershell comand:

Start-DedupJob -Volume"E:" -Type Unoptimization

This command causes the server to blue screen.

Any suggestions?

JLC