how to move the files that should be deleted to somewhere else

[Jerry Fleming]

I am using rsync version 2.6.4 on Debian 3.1rc. I use rsync in this way:
rsync -avLz -e ssh --progress --delete --exclude=file 
root at 192.168.0.31:/data/lessondev/ /mnt/usb/
Now I would like all old files that should be deleted to be kept in 
somewhere else, maybe also renamed to append a timestamp. Any suggestion 
will be appreciated.

- Jerry