"you can tee stdout to a file > > $ rsync blah-blah |2>&1| | tee rsync.log "|2>&1" grabs both stdout and stderr. Now you can view rsyn.log at your leisure."
Additionally, you can use -vv to increase verbosity and use -q so that only errors get written out to a log file. Also, using the -n option, will do a dry run and not copy any files. Which you could do now and should run fairly quickly. So, trying running your rsync command with the option set of -vvqn with Ed's pipe out to a log file, | tee rsync.log and see what you get.
