Access Data such as: Music, Video, Photos, Contacts, Notes, Call History, Text Messages (SMS), Voicemail and Voice Memos and with a Jailbroken device even the root file system.
A rather unique feature is to ability to access your phone and sms logs.
"No hacks, no hassle: you are a click away from having your iPhone’s SMS messages and iMessages copied to your computer.DiskAid instantly exports your call history log, voicemail, voice memo, notes and your whole contacts list. Just drag and drop items from the DiskAid window to your desktop!"
Another interesting feature is access to the sandboxed file storage of all your installed apps, which allows you to manipulate save games or just check what data certain apps keep.
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For apps that use iCloud you can open the according local iCloud folder.
If your device is jailbroken you can access the root filesystem as well.
(Root access does require a jailbreak)"
DiskAid is a great tool that gives you more control over your device in terms of backup and file access. It's available for Mac OS X and Windows with a free version that has some small limitations or the full version for just $24.90.