Hello Temyk,
Unfortunately I didn't do backup. But the optimization doesn't work well with the recently uploaded images and this is the bigger problem. I can't optimize the thumbnails what I use because I don't see these sizes on the settings page.
Thank you,
Hi!
I optimized all of my website's images with the plugin. Everything went well. On gtmetrix I had 100 out of 100 points on image optimization.
But later I realised that I have a lot of unused thumnail sizes so I regenerated the thumbnails with a force regeneration plugin.
Now the plugin...