So, did this happen because he copied the data while in an inconsistent state? I'm a bit surprised that an inconsistent index is ever left on disk (except for temporarily while something is being written). Would this happen if there was a Writer that was not closed?
An index should never be left in an inconsistent state. After a crash lock files may need to be removed, but that's it.
However, backing up an index while it is being modified is tricky, since it is a moving target. At any single point in time the index is consistent, but the backup process is not instantaneous, and views the index at a number of points in time.
Doug
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