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This just happened to me today
(lemmy.ml)
It took 2 more hours than it should have to copy 125GB
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this post was submitted on 28 Aug 2023
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Rsync checks the files and only issues the copy if the file size/modified dates are different by default. Ignore existing will not overwrite a changed file afaik.
If the file is large it only sends the changed blocks (e.g. you have a 100gb database and only a dozen 4mb blocks have been modified it won't send the full 100gb across the network)