Wget: convert-links and avoid redownloading already fetched files?

I am downloading data spread among multiple files that don't change once published.

Therefore --timestamping is not good enough, because it is constantly checking whatever resource is changed, which is, in my case, completely pointless.

--no-clobber would fit perfectly. Unfortunately it doesn't work with --convert-links for some reason.

Both --no-clobber and --convert-links were specified, only --convert-links will be used.

I hoped that --backup-converted would help but it changed nothing (it works for --timestamping.)

Why wget --convert-links --backup-converted --no-clobber --wait 1 https://example.com ignores --no-clobber and how could it be fixed?