copy to destination only new files

[.]

I'm using rsync to copy files from a source folder to a destination 
folder.  It works fine.  But, to save some time, what options should I 
use to only update or copy (to the destination) files that are new 
and/or have a new time stamp on them?

Here's the code I use below (pretty sure the -n means dry-run)


rsync -r -n -t -v --progress -s '/Desktop/Book' '/media/Chip/Book June'


Thanks,

Peter

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