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how to copy files

I have a folder in hard drive and a backup of it is made in a USB disk
Now some new files are added to the folder in hard drive
how to make the folder in USB disk the same as in hard drive?

I want a program that can check the two folders
if file size and file name are same, they are regarded as same
if not, update is needed

I have try rsync, but can't find such options

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