Do I have this correct that you want to let the user select where the install
directory is and also where the directory is that their data is stored? You
can do this in WiX by adding a user interface to your installer and make use
of the DirectoryList and DirectoryCombo controls. They'll let the user
navigate to and select folders. As for backing up your data, WiX does let
you copy files with its CopyFile element. You might want to experiment with
it though because you may not need to back them up. WiX may only remove the
files that it knew about at install time. So other files created by your
application would remain on the machine, untouched during an upgrade or
uninstall. But you'd want to check that out to be sure.
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