From Windows 2008 to Windows 2012 the robocopy utility has been changed. Now it detects all files an “modified”.
I use robocopy to bring data from remote office to the centralized file server and back them up further. I’m not sure if robocopy actually copies files or just changes some attributes, but NetBackup sees the files as new and back up all of them even during incremental backup.
After battling the issue on my own I have opened a case with Microsoft. Together with MS engineer we have found two potential solutions