It is known that Robocopy has performance issue when handling large size of data. Also copy large files to an compressed folder will also use certain system resource. Thus the result may be caused by these 2 actions.
Have a test to only copy 1 file to target folder and see if issue still exists. If not then you may consider backup files in batch as a workaround (or backup to a differernt and compress it later).
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I have no problem in using the same tool (robocopy) to copy 900GB of files to a non-compressed partition/volume and the problem also occur using Explorer.exe and other tools. The problem, IMHO, is only related to the compression state of the partition/volume
It´s odd to me that a OS can allow users to do actions that can cause instability to the system. It´s odd to me that it is happening in 2011 with super-hardware and brand new OS, not NT systems or vanilla hardware...
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