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Windows huge disk usage

Yeastrday I found this problem:
I have a server with 60GB C:\

Server takes a huge disk space, but by explorer.exe C:\ takes only 20GB, where it is a rest of space?
I try rescan filesystem by WinDirStat but without success... So I try to turn on a unkown files.


Here it is....


Better tool which I found is TreeSize


I can see now a huge of memory takes System Volume Infromation
It is probably turned on Shadow Copy which, if you has runned server on vmware and you have turned on backup of storage or if you have a replicated sderver with another, you don't needed.

Verification:
run powershell as a admin
vssadmin list shadowstorage


If you want to get smaller usage of shadow copy
vssadmin resize shadowstorage /on=C: /For=C: /Ma
xSize=10GB

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