Silent Install - But backup folders first with Custom Action
As part of my Basic MSI Project, one of the requirements is to backup folders before installing - this has been achieved via a custom action and works when the GUI is shown.
However, another requirement is to have the ability to install silently. This fails at the point the custom action occurrs.
I have read up on deferring custom actions, but I believe these only run after the files have been moved!! Which obviously does not work for me.
Deferred mode is indeed when data transfer or removal is taking place, but it's made up of many steps. Perhaps try an appropriately conditioned deferred custom action that runs before, say, RemoveFiles?
If you want the action to run for both silent and UI installations, you might move the action to the Execute sequence and change it to deferred execution. In general, deferred mode is strongly recommended for any actions that touch the target system; the UI sequence and immediate mode are for gathering information but not making system changes.
