How do I create a copy of an sqlite database in qt ?

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QT

QT-Creator

C++14

i am making a library management system in qt c++ in it i want to make a backup of database when user clicks the generate backup but i have no idea about how do i do it

What I have tried:

void liberarian::on_generatebackup_clicked()
{
    Generator bu;
    bu.setModal(true);
    bu.exec();
    /* do something here to make a backup of the databse*/
}