How do I delete iPad backups from iTunes

This article might be helpful -- it refers to iPhone backups, but the procedure for iPad is exactly the same:

http://www.idownloadblog.com/2014/08/02/how-to-delete-iphone-ipad-backup/

Alternatively, you can navigate to the files in Finder and delete them manually. Click on the desktop, then hold down the Option key while clicking the Go menu. Select Library, and navigate to the folder Application Support/MobileSync/Backup. All your device backups should be stored there.

Hope this helps!