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lets say one of those 10 x 20 TB drives statistically fails within the next decade but 95% of the rest works fine for the next 20 years , will you survive that ?? or are you willing to pay 10times the price to archive the 99% level of security..then use tapes but deal with the issues (time, price, trickiness etc)..also please do avoid RAID, theres no need to have a system for offline storage where one disk depends on the other. also one thing, if you are in need to get back to some of the data, accessing the bare metal of the harddrive is much faster and easier then restoring it from tape. another thing with tapes, the bottleneck is the tape reading machine, they do make problems with outdated drivers or mechanical issues after 10- 15 years too sometimes,especially when urgently needed. a data center can cope with that but a single user.....
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