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I made a backup of my disks by using dd and now I want to restore it. But since most of the data has remained unchanged, I wonder if rsync backup.img /dev/sdX would help speed up the process or it would take just as long.

The main reason I don't know is that I am not sure if rsync will update the sdX 'file' with the different chunks, or if it will see them as different and copy the whole thing anyway

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