rsync - Sep 2010 - can't create a local mirror

I either have a problem with rsync or it is not intended to do what I am 
asking it to do.

I am trying to mirror a copy of /home/foo to a local usb drive.  The copy is 
made, but the destination does not appear to be deleting files I have deleted 
on the source.  Here is the command line I am using (part of a script I use to 
do this and other housekeeping chores):

As root:

rsync -av --progress --delete --exclude /home/foo/.local/share/Trash \
--log-file=/home/foo/Desktop/$(date +%Y%m%d)_rsync.log.usb$disk \
/home/foo /media/usb$disk

What am I doing wrong?

On Sat, 2010-09-25 at 13:16 -0700, Tim Hanson wrote:
> I either have a problem with rsync or it is not intended to do what I am 
> asking it to do.
> 
> I am trying to mirror a copy of /home/foo to a local usb drive.  The copy
is
> made, but the destination does not appear to be deleting files I have
deleted
> on the source.  Here is the command line I am using (part of a script I use
to
> do this and other housekeeping chores):
> 
> As root:
> 
> rsync -av --progress --delete --exclude /home/foo/.local/share/Trash \
> --log-file=/home/foo/Desktop/$(date +%Y%m%d)_rsync.log.usb$disk \
> /home/foo /media/usb$disk
> 
> What am I doing wrong?
Check the log file for any relevant error messages.  In particular, if
the sender gets an error that could result in the omission of existing
source files from the file list, deletion will be skipped.  If this
occurs, rsync will print the message,
"IO error encountered -- skipping file deletion".

-- 
Matt