There are several different technologies that use the term file shadowing, but the intent of file shadowing within these technologies is to provide an exact copy (or mirror of a set) of data.
For file shadowing to be effective, the shadow needs to exist in a separate physical location than the original data. Depending on the reasons behind the shadow operation, this location may be as close as a second harddrive in the same chassis or as far away as the other side of the globe.
- N-level file shadowing and recovery in a shared file system, United States Patent 5043876
- Method of file shadowing among peer systems, United States Patent 5276871
- Database Shadow Files
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