Customizing compression per file?

I have an rsync cron job to backup folders that contain many different
types of files. Most of these are uncompressed files, so the -z option
would speed up their transfer. However there are a few files that are
already compressed where -z will just needlessly burn CPU and slow down the
transfer. Is there any way to express something like, "compress all files
except those with extension XXX?" The files are in a proprietary format
so it doesn't make sense to add them to a whitelist in rsync itself.

Thanks,

Joe G.

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