Suppose you as a software developer has set up daily builds of your software for testing purposes. Every day you make a new build, users have to re-download the updated build to evaluate it. In this case you may want to enable differential downloads, so that users can download only difference between two builds, thereby saving on the server’s bandwidth. Users will also be happy as they don’t have to wait to re-download the whole thing. Similar situations are encountered when you want to set up a download archive which allows incremental sync for users.
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