Windows Backup uses windows shadow copy service to get files that are in use. This is especially useful for backing up Quickbooks or Microsoft Office Documents that are in use.
Perhaps even allow several different calendar formats. If you pick Wednesday as first day of week, the small calendars on the right change but not the main calendar view.
Make it resizable so you can make it bigger to more easily see the paths of the files to delete. (it is a pain to stretch the dialog INSIDE the window and then scroll)
