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Why is disk shadowing considered expensive?
Disks must frequently be replaced
Shadowing software is expensive
Employees must monitor two disks
Two or more drives hold the same data
Disk shadowing is a technique for maintaining a set of two or more identical disk images on separate disk devices. Its primary purpose is to enhance reliability and availability of secondary storage by providing multiple paths to redundant data. Disk shadowing is considered expensive because two or more disks are used to hold the same data and thus creates redundancy.
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