An advantage to HSM that is commonly leveraged by the vendors is a reduced backup window. Since stub files are typically only a few KB is size, they are backed up much faster than the potentially very large files they replace. In addition, some HSM solutions fully integrate with selected backup products providing an HSM aware backup solution and the ability to leverage an existing backup & restore infrastructure. Depending on your existing backup environment and your choice of HSM solution, the extent of your investment could be limited to software and additional tape storage capacity. A simple Web search on ILM and HSM will reveal the various options available to you. Specific brand names are purposely left out of this response to avoid offending vendors that might be overlooked.
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