The problem is that the object that yoru schedule is trying to backup is:

C:\Meus Documentos\*

It has a space, but no quotes around it.  So when it tries to back it up
it's only getting the C:\Meus bit.

Try updating the object to be:

"C:\Meus Documentos\*"

The problem is that if you type
update sched standard wbcdf017 obj="C:\Meus Documentos\*"

You won't get the quotes.  Surround the whole thing in single quotes outside
of the double quotes and it'll work, as in:

update sched standard wbcdf-17 obj='"c:\Meus Documentos\*"'

This will work.  Note the single quotes surrounding the double quotes.
Also, of course you should substitute your domain for where I've put
'standard'.

later,
Paul