What is Windows vShadow? A volume shadow copy system for Windows. Interestingly, Windows vShadow can be a security risk, used as part of an exploit. See here for an example.
20180828/DuckDuckGo vshadow
20180828/https://bohops.com/2018/02/10/vshadow-abusing-the-volume-shadow-service-for-evasion-persistence-and-active-directory-database-extraction/