Great idea for people who don't have root access! One refinement: you can simplify making the compressed copies by doing
zip temp *html.en
gzip --best *html.en
unzip temp
That way you don't have to do it file by file. A further refinement, I suppose, is that if you edit some of the files and want to update the gzipped ones you should first
rm *gz
and then run the commands given above.