You can find the answers of FoneDog you need here.
You can download FoneDog toolkit for iOS (Mac) anywhere you like: product page, solutions page. It's virus-free and fully compatible with Mac OS X 10.6 and above.
Find FoneDog for iOS (Mac) installation package file .dmg you've saved on your Mac. Double-click it and drag the icon of FoneDog for iOS (Mac) to the shortcut Applications folder.
After launching FoneDog for iOS (Mac), you'll be asked to register the software. If you have purchased the license, then you can get the registered license and email address in your email. If you haven't paid for the software yet, please click the "Buy now" button on the program to pay for it. After then, type in the licensed email and registration code, click "Activate" to unlock the full version.
To assist you in retrieving your Apple ID, you can get it directly from Apple via this link.
You can also click on the ”Forgot your Apple ID or Password” link in the lower part of the software screen.
You can also go directly to the Apple ID website to reset your password at appleid.apple.com/.
Tip: Be sure to check your junk mail folder in case the verification message is marked as spam.
FoneDog for iOS enables you to select the hard drive that you wish to scan for the iTunes Backup File that you will recover from, and it can be directed to an external hard drive as well.
Tip: Ensure that you select the correct iTunes Backup File, and if the file is encrypted you need to decrypt it beforehand.
Because they are not deleted as you thought.
Files in your device are stored using index structure. Index structure is like the catalog in a book. Device can find a file quickly using the catalog. When we delete a file, device only delete the index so that the file cannot be found anymore. The file itself, however, is still there.
That is why it takes so long to copy or move a file but only an instant to delete one. The file is just only marked as "deleted" but not actually deleted.
So it is possible that those deleted files can be recovered by other means. And FoneDog can provide you a solution to erase data permanently.
How can FoneDog erase data permanently?
First of all, FoneDog will erase the real files in your device, not just index.
Moreover, after erase the file itself, FoneDog will fill your device storage with random data to overwrite deleted files, then erase and fill again until there is no chance of recovery. Military grade algorithm USDo.5220 is used to erase and even FBI cannot recover erased device.