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using rsync to backup files

hello, i am trying to use rsync to backup files from source to destinaion but only those which are missing in destination.
i use:(just example)

Code:

rsync -auv /home/user/{C++,Python,Documents} /media/usb/BACKUP/

so if i create in /home/user/C++/hello.cpp and run the rsync command as above it should copy only this one file hello.cpp but i see in the output it copies everything from C++, Python and Documents.
even though this example i found in google and fom man page i cannot figure out which options should be used to copy only missing files in destination.

can you help me ?
thanks

Hi newbie0101

Try the following command and it should work:

Code:

rsync -auv --ignore-existing /home/user/{C++,Python,Documents} /media/usb/BACKUP/