Deduplication and bandwidth

If I am uploading a file to SAFE and that file already exists, are the hashes of each chunk compared before actually uploading, so I won’t have to use any bandwidth or will it have to upload the data to SAFE before figuring out that the file already exists?

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Your client will say to it’s close nodes: "I locally self encrypted this file and here’s the first hash: “dkjghfdksjghkdjshgk”. Your close nodes will look at these addresses to see if that chunk is already stored. If it is, no need to store it again.

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