> 19:44:06	Error: 	Unexpected backing error for
> www.who.int/goodwill_ambassadors/es/index.html
> I could not find any entry for "backing error" or
> "unexpected backing error" in Fourm or through a
> Google search.

What version of httrack are you using ? Can you retry the same mirror, with
verbose logs enabled, and give me the few lines before this error ? (to enable
verbose logs: do in 'Set options' / 'Log, Index, cache' and set the 'Create
Log files' to 'debug')