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How Does Mirror Shielding Work?

Imagine at work you had an important meeting with several coworkers to draw up a business plan. The business plan would be sketched out on a whiteboard and take several days to complete, meaning it would be left overnight where others could access it. However, unless you wrote it with permanent marker, it would be quite easy for someone to come by and erase it or modify it. You could put a note on the whiteboard to tell everyone not to erase it, but people may miss the note or just ignore it.

One way you could protect the whiteboard would be to put a piece of glass over it. Anyone who tried to write over or erase it would only affect the glass, the whiteboard behind the glass would be protected. When you come back the next day you can just wipe off the glass and your business plan would remain intact.

Mirror Shielding

This is similar to how Mirror Shielding™ works. When NeuShield Data Sentinel is installed it adds a barrier to your protected files preventing them from direct changes. When an application tries to modify a protected file, it gets redirected and the file modification is stored on an overlay, keeping the original file intact. Later, if you want to go back to the original file you can simply delete the data on the overlay. This process of deleting data on the overlay is called reverting changes.


Reverting is useful for undoing changes to your files that you don’t want. For instance, if you accidentally save a new document over the top of an existing document you can go back to your original document. It is also useful in cybersecurity by allowing you to reverse undesired changes that ransomware or other malware does. When ransomware tries to encrypt your files, the encrypted files are stored on an overlay, but the underlying files are never changed. You can simply revert changes, which will delete the encrypted data, allowing you to access your original, unencrypted files again.


This method of recovering files is also useful for performance. It is significantly faster to delete a file than to copy or restore a file, which is what a backup does. Because of this NeuShield Data Sentinel can recover data almost instantly, no matter how much data is being protected.

But it is not just reverting files that is quick. Since the overlay only stores file changes, which need to be written to the disk anyways, there is virtually no performance overhead on your actual disk. NeuShield Data Sentinel can protect files with virtually no impact to your computer’s overall performance.