You can now use your iOS device as a portable USB Flash Drive. Introducing the Phone Drive.
You can then play, browse, organize, share, download, and manage your files right on your iPhone, iPad or iPod Touch.
Features
1) View Files / Folders in your app
2)Create Sub Folder to manage Files
3) You Can Copy/Cut Multiple Files/Folder and can paste
4) You can delete from the app
5) It can Supports Text Format , Web page , Audio and Video format to and play
6) you can file transfer from your computer to your iPhone, iPad or iPod Touch via ITunes
It is a good app for the Back-up purposed