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Why do we need deduplication on device?

I didn’t get why do we need deduplication on devices? In what cases we will have duplicates? Is this the case when we copy some file in workspace?

Hi artem3,
Deduplication is designed to combat the problem organizations of all sizes deal with on a regular basis – duplicate data. For some, it’s an accumulation of the same files. For others, it’s a collection of files that aren’t completely identical yet contain pieces of the same data. Even though the types of duplication are different, the results are all the same as precious space is needlessly consumed. Deduplication maximizes storage by eliminating duplicates and replacing other copies with metadata that points back to the original. E.g., in a file hosting service like Dropbox (as mentioned in the lesson), suppose it has 200 instances of the same file attachment. Data deduplication will clear out the copies for just 1 copy. It could save you space for another 199 files of the same size.