The question I have is what happens when you run your data sets through a compression program like RAR? One of our standard Database backups weighs in at 60gb, but compresses nicely down to about 5gb. If you can get your compressed data set under 2tb, I suggest backing up the compressed data set on to a mirror set and store it. The trick is getting it small enough to fit on a single drive. If it doesn't compress nicely, and still ends up requiring some kind of disk spanning, just stick with what you're doing. It's a solid solution.
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The question I have is what happens when you run your data sets through a compression program like RAR? One of our standard Database backups weighs in at 60gb, but compresses nicely down to about 5gb. If you can get your compressed data set under 2tb, I suggest backing up the compressed data set on to a mirror set and store it. The trick is getting it small enough to fit on a single drive. If it doesn't compress nicely, and still ends up requiring some kind of disk spanning, just stick with what you're doing. It's a solid solution.