Qt Installer Framework - call script BEFORE start of update

[Nando]

Hi,

i try to call a script BEFORE the update starts.
I need to copy (backup) an existing file, before the update starts and overwrites the file.

Here is the code i try, but i seems it is called too late because the update already removed the file:

function Component()
{ 
    // default constructor
}

Component.prototype.createOperations = function()
{
    component.addOperation("Copy", "@TargetDir@/database/live.db", "@TargetDir@/database/backup.db");

    component.createOperations();
}

Greetings
Nando