The introduction of tape made it possible to back up everything, keep copies off-site and restore older or deleted files as needed.

引入磁带使备份一切东西、在机房以外的地方存放拷贝以及按需要恢复陈旧的或者删除的文件成为可能。

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And because the whole system can store so much information, back-up copies of everything in it can be made internally in more than one brick, meaning that such a failure destroys no data.

ECONOMIST: Data-storage systems