If you use iPhoto you may have noticed a bunch of tiny cropped face photos showing up in your Ever back-up. iPhoto automatically creates and stores these thumbnails in a folder and Ever temporarily allowed these to be backed up via the Web app. For now, the only way to remove these from your backup is to manually delete the photos.
To delete an individual photo, click on the photo to view it and then click the small trash can in the upper right hand corner of the screen.
To delete a group of photos, go to your Photos tab and click "Select" in the upper right hand corner. Then select the photos you'd like to remove from your Ever and press "Remove".