I was using rsync to copy files from a big external backup drive to an even bigger external backup drive I just got. (It's a 500 gig Seagate FreeAgent Go, which requires only the USB connection for power.) I got a bunch of these errors:
rsync: recv_generator: failed to stat "/path/Rough-Guide-to-Tango/15-N\#351stor-Marconi-Tr\#355o---Cuando-T\#372-No-Est\#341s.mp3": Invalid or incomplete multibyte or wide character (84)
I installed convmv ("converts filenames from one encoding to another"), ran
convmv -f latin1 -t utf-8 *, ran it again with
--notest, and then rsync worked without any trouble. Nice!