Zend certified PHP/Magento developer

Simple rsync log: transfer errors + number of transferred files

I am setting up an hourly rsync job and want a simple log for that job. If the rsync succeeds without errors, I would only like the following line to be added to the log
[TIMESTAMP] [X] files transferred (or similar). If there is an error syncing any of the files, I would like one line per failed file with filename and error message.

I have tried --log-file but that lists all the files (e.g., >f+++++++++ for created files) and I have not been able to figure out how to remove the file itemization. --stats gives too much statistics.