In a nutshell, tape is a good choice because it's portable. Also, tape is low-cost because of its energy-efficient storage of offline data for large monthly or weekly full backups or archives that leverage disk to disk to tape with a VTL. Keep in mind though, if you leverage tape for your bulk offline data, keep a gold or master copy of data on disk, as well as for long-term archives complimenting disk to disk for fast backups and restores....
Of course if you have no tape and are thinking of cloud storage or leveraging removable hard disk drive, then tape may be a mute point. But overall, whether or not you need tape really depends on your specific needs.
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