When an image is uploaded to WordPress if the Imagify plugin is set up the photo will automatically be optimized. At that time the photo will also be sent to Imagify’s server and be stored there for one hour.  They will also send the photo back to your site and it stays there indefinitely. Even if you delete your account. If you upload photos to the online website they will be stored there for 24 hours with the free account. If you have a paid subscription they will stay there for as long as you have an account