mv file with illegal character

[Jim Weeks]

This isn't a really a freebsd question, but I can't seem to find the answer
to this elsewhere.  I imagine that some of you may have come across the
same situation.

One of my clients has renamed a directory -backup and now she can't do a
thing with it.  Any command seems to pickup the -b as an option rather
than part of the name.  I've tried *backup and still the illegal option
error occurs.

Any ideas? Thanks for your off topic indulgence in advance.

--
Jim