How does a server know whether your local files are corrupted, version mismatched, or illegitimate without you uploading to the server? If they have to check through every file for integrity, wouldn’t that effectively be the same as downloading/uploading the entire folder?
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They do a weird math formula called a hash to the whole file. It comes out to a single really long number. They do that formula to the file before and after downloading. If the number matches, the file is identical.
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