The App will only access the information and files the user explicitly asks it to access. For example, if the user asks the App to backup the file C:\file.txt and send it as an attachment to an email, then the App will read and send that file to the specified recipients.
The App will only store in internal or external databases the information that the user explicitly asks it to store. For example, the user can ask the App to create databases with email and FTP connection information (servers, user names and passwords) and lists of recipients.
The App will only transmit the information the user explicitly asks it to transmit. For example, the user can ask the App to copy a file to a network share, or send a file to a list of recipients, and the App will do that.
The App will not access, store or transmit any information without the user's knowledge; the App will not access, store or transmit any information without the user's explicit request or approval.
In the unlikely event of a crash, information about the crash might be uploaded to the Microsoft servers, depending on your privacy settings (Settings > Privacy > Diagnostics & feedback).