I want rsync only download new files and keep old files

I install Arch i686 in home and in home I do not have internet connection , so at work I download all packages I need with this command
rsync -avrt --bwlimit=58 rsync://mirror.datacenter.by/arch//extra/os/any/ /home/ddd/i686/
and move them to home and then copy them to
/var/cache/pacman/arch
and install packages with pacman
after two days , I run this command
rsync -avrt --bwlimit=58 rsync://mirror.datacenter.by/arch//extra/os/any/ /home/ddd/i686/
and I see rsync get last packages again and use many Bandwidth
how I tell rsync only download new files and keep old files

rsync manpage says the following:
-u, --update skip files that are newer on the receiver
--inplace update destination files in-place
--append append data onto shorter files
--append-verify --append w/old data in file checksum
I guess you need to add -u flag.
Reading manpages is the highest virtue in GNU/Linux.

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I want rsync only download new files and keep old files

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