Revision History is a feature of the product that allows you to see the various layers of protection added by NeuShield as well as the ability to restore, revert or save a copy of the file at each of these layers.
To access Revision History you can right click on a protected file and select the “Revision History…” menu item. If the menu item does not exist, then it means that file is not protected.
When you are using NeuShield there can be up to three layers of data stored for each protected file. These layers include the overlay, the disk, and the data engrams layers.
When NeuShield protects a file, it marks the file as protected and adds an overlay to the file. Any changes to protected file is redirected to the overlay. This process of protecting the file using an overlay is called Mirror Shielding™ and allows you to recover your data instantly, without relying on backup or rollback.
The overlay layer can be seen on the Revision History window by an icon of a pane of glass.
On this layer you have the option to revert the file. Reverting this file basically removes the data on the overlay for this file and sets the contents of the file back to its on-disk version. This is basically the same thing that would happen if you reverted the folder, but only for this one file.
The disk layer shows the actual file that is on the disk. This is the file that is protected by NeuShield’s Mirror Shielding technology. If the file has not been modified since the last commit cycle, then this will be the same file that you will see when you open the document normally.
The disk layer can be seen on the Revision History window by an icon of a disk.
On this layer you have the Save As option. This allows you to save the contents of the file on disk to a different location.
Data Engrams are older versions of the protected file. A Data Engram is created when the contents of the file on disk is changed during a normal commit cycle. Protected files can have multiple Data Engrams depending on the settings that are configured in the NeuShield portal.
The Data Engram layer can be seen on the Revision History window by an icon of a database.
On this layer you have the Save As and Restore options. Save As allows you to save the contents of the file on disk to a different location. The Restore option allows you to replace the contents of the file on disk with the contents of the selected Data Engram.