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Shadow Copy (also known as Volume Snapshot Service, [1] Volume Shadow Copy Service [2] or VSS [2]) is a technology included in Microsoft Windows that can create backup copies or snapshots of computer files or volumes, even when they are in use. It is implemented as a Windows service called the Volume Shadow Copy service.
The Volume Shadow Copy Service (VSS) keeps historical versions of files and folders on NTFS volumes by copying old, newly overwritten data to shadow copy via copy-on-write technique. The user may later request an earlier version to be recovered. This also allows data backup programs to archive files currently in use by the file system.
Like many other ransomware families, Ryuk deletes shadow copy files and stops processes from the hardcoded list. Once Ryuk takes control of a system, it encrypts the stored data, making it impossible for users to access unless a ransom is paid by the victim in untraceable bitcoin.
In NTFS, an entity in the filesystem fundamentally exists as: a record stored in the MFT of an NTFS volume, the MFT being the core database of the NTFS filesystem; and, any attributes and NTFS streams associated with said record. A link in NTFS is itself a record, stored in the MFT, which "points" to another MFT record: the target of the link
Others, like UFS2, provide an operating system API for accessing file histories. In NTFS, access to snapshots is provided by the Volume Shadow-copying Service (VSS) in Windows XP and Windows Server 2003 and Shadow Copy in Windows Vista. Melio FS provides snapshots via the same VSS interface for shared storage. [2]
In some situations, continuous data protection requires less space on backup media (usually disk) than traditional backup. Most continuous data protection solutions save byte or block-level differences rather than file-level differences. This means that if one byte of a 100 GB file is modified, only the changed byte or block is backed up.
With Windows File Protection active, replacing or deleting a system file that has no file lock to prevent it getting overwritten causes Windows immediately and silently to restore the original copy of the file. The original version of the file is restored from a cached folder which contains backup copies of these files.
Rearranges files stored on a hard disk to occupy contiguous storage locations in order to optimize computer performance dfrgui.exe: Windows 95, Windows 2000: Event Viewer: Lets administrators and users view the event logs on a local or remote machine eventvwr.msc: Windows NT 3.1: Resource Monitor (previously Reliability and Performance Monitor)