I assume you mean you want to use the NAS device as a target to copy data to from the individual servers that have direct attached storage and then copy data from the NAS device to a tape system. If you are using files in a file systems on each of the direct attached storage devices for the servers that should work. This is what is known as a two-stage backup strategy. Using whatever non-disruptive copy software you have or quiescing the applications accessing the data, you can copy to file systems allocated on the NAS device.
Later you can use backup software that works with the NAS device you have chosen to copy data to tape devices. This should be an effective solution.
Evaluator Group, Inc.
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This was first published in August 2002