What, you really think OO is the only way to archieve this? Don't be silly.

    use Backup;
    Backup::doit config => "/etc/sys-backup.cfg";
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works as well as an OO-wrapper.

I've written backup programs in Perl as well. It did use a configuration file, and the functionality was changed without the need to change the interface. And guess what? It wasn't OO!

Abigail