How to back up and restore PDF documents on iPad/iPhone using iTunes First, a little bit of background information.There is a subtle difference between updating and reinstalling an iOS app.When you update an iOS app (i.e. install a new version over an older version), your app settings and preferences are retained. On the other hand, when you first uninstall an iOS app and install a new version (or even the same version) of the app, your app settings and preferences are erased by the operating system (iOS). Note that this applies to any iOS apps, not just Adobe Acrobat Reader for iOS.Additionally, when you uninstall Adobe Acrobat Reader for iOS, any documents that are stored locally on the device will also be removed.To prevent unintentional data loss, it is recommended that you back up your iOS device regularly.How to back up your iPhone, iPad, and iPod touch - Apple SupportBut what if you want to back up only the documents and folders (containing documents and sub-folders) in Acrobat Reader that are locally stored on your iOS device?Here ar