An Android application to perform over-the-air encrypted backups of photos to cloud storage services. This means that should anyone gain access to your cloud account they won't necessarily be able to view the images from your 'phone as each image is stored in an encrypted form.
Google+ includes functionality to back up your Android phone's media collection, however some may have concerns about uploading their photos to Google in a form in which they can be viewed should anyone get access to your Google Drive account or you may simply not want to use Google+ and Google Drive to achieve this.
Android Phone Backup is intended as an alternative to using Google+'s media backup service - it does, for example, add encryption to the Google+ service. If you continue to use Google+'s media backup then you will be continuing to upload viewable images to Google Drive.
It's also important to note that the images on your phone remain unchanged - they are not encrypted or secured in any way - you should take appropriate precautions to prevent someone accessing the data on your phone in the case that it is lost or stolen.
Q: I've forgotten my password - is it stored anywhere? A: The password is stored on within the application. If you've uninstalled it, no longer have access to the device or have cleared the application settings then there is no way to retrieve it. The password is not stored on any of the cloud services which files are uploaded to.
JavaDoc "How to" guide "FAQ"