Where are the optimized images saved?

Umm, no, it doesn’t create new images, it optimizes your existing ones.

So I want to undo those optimizations. How do i that?

you restore from your backups. you do have backups, right?

ooops! well, not much damage was done. i guess deleting the wp_ewwwio_images table will be okay?

unless you were using lossy optimization (which is not ON by default), there shouldn’t be any damage done, and yes, you can delete the ewwwio_images table.