Using Gutmann method for securely deleting files in Windows.
...Considered by some to be highly effective for preventing file recovery.
Requires .NET Framework 4.0
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Systems & Safety Establishment
https://sarab.me
Source Code available in c# with comments.
Reference: http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html
.NET project which allows Backup/Restore of NTFS reparse points. No program is available to perform this operation other than custom scripts or full disk backup/restore. This is essential to any production environment which uses NTFS reparse points.
...Cooler or less frequently accessed data is automatically moved to cloud storage, freeing up local storage capacity. Your applications can continue to access all files as if they reside locally—no changes to your code or workflow are required.