In Windows ® 8 and Windows ® 10 the shadow volumes have been superseded by file history. VSS is an incremental procedure (like the incremental backup concept of databases), which means that it will store only the modifications that happen to one file since the last snapshot. If a specific block hasn’t changed since the last snapshot, it will not be included in the current snapshot (restore point). When a specific block has data written to it, VSS makes a snapshot and stores it in a hidden volume (these snapshots are read only). VSS is tracking any changes made on all blocks in the storage volume. VSS operates on the block level (below file system level). It is important to note that VSS is not an image of the entire drive. You can, of course, still create system restore points manually if you wish. If the two conditions were met simultaneously we can expect to have a system restore point every 2 days under Windows ® Vista and between 7 and 8 days under Windows ® 7.
#Managing shadow copy space portable
However, there are some conditions when this happens such as when the system was idle for at least 10 min while it was running on AC power (in case of a portable computer). It is difficult to predict the other cases when VSS creates a snapshot.
#Managing shadow copy space software
The snapshots created by VSS (restore points) are taken at specific time intervals, usually after installing/uninstalling new software or performing a system update. VSS technology works only on volumes formatted with NTFS, and the shadow copies created could be stored on local or external networks as needed. We can access this feature through the system restore functionality, which enables us to restore our system files to a previous stable state in case of sudden system failure (eg, failed software installation, wrong uninstallation of some programs, or wrong system registry modifications). VSS coordinates the actions that are required to create a consistent snapshot copy of the data to be backed up in a specific volume at a specific point in time over regular intervals. The screenshot in our next experiment is applicable to Windows ® Vista, 7, 8, and 10. Volume shadow copy service (VSS) is a service supported by Microsoft Windows ® XP and all later versions of Windows ® however, not all versions of Windows ® handle the GUI portion of this service in the same way (when restoring previous versions of individual files-more on this feature in Chapter 6). Nihad Ahmad Hassan, Rami Hijazi, in Data Hiding Techniques in Windows OS, 2017 Hiding Data Inside Windows ® Restoration Points
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