My guess would be that, having a Windows phone, you may either have inadvertently given permission for photos to be backed up to OneDrive, or you may not have opted out of it if it was default on the phone. I have a few photos on Google Drive that got there the same way. Do you use hotmail/msn/outlook .com email? If so, that login is your login to OneDrive. I don't know windows phones, so I don't where in settings you would look to stop this. Maybe this will tell you where to look. http://www.windowsphone.com/en-us/h...save-the-photos-and-videos-i-take-to-onedrive I don't back up photos to OneDrive, but I use it to have documents available to me on any device or computer. I could use DropBox just as easily, but OneDrive is convenient since I use MS Office extensively.