[CentOS] rsync and swapping

hi all,

I use rsync to copy/backup ALL my stuff to another disk.

When I run this seems like my machine (4 GIG ram centos 5.1)
now begins to swap out more programs. Is there a way to reduce
that swapping? I am running with echo 1 > /proc/sys/vm/swappiness

I simply mount /dev/sdc1 /mnt/backup; mkdir /mnt/backup/month.day.year
then rsync -a /home /mnt/backup/mon.day.year

This is approximately 102G of data.

Thanks for any suggestions.

Jerry