WP Smush Pro - backup original image

Hi,

when I turn on backup of original image (.img.bak), it backups all the thumbnails. Is there a way to backup only the original image? (name.jpg, not name-125x125.jpg etc.)

It will be a huge space saver and when you have original image there are lots of plugins to regenerate thumbnails, so backups of thumbnails are useless.

Thanks.