This has been answered a couple of times recently so search for the full details.
If you need multiple copies and desire some sort of off-site capability, then tape is the only cost-effective solution.
Any other solution offers single copies with no protection against deliberate deletion, accidental deletion, disk failure/corruption or fire.
Other threads have given prices and options. For example, HP for example sell Type 2 LTO/Ultrium drives capable of backing up 173GB per hour and squeezing 400GB on a single tape.
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