This magento extension enables saving PDF invoices on filesystem.
Magento >= 1.5
https://www.magentocommerce.com/magento-connect/catalog/product/view/id/31348/
This extension can also be installed through Modman or via composer.
For further information about Modman see https://github.com/colinmollenhour/modman/wiki/Tutorial For composer see https://github.com/Cotya/magento-composer-installer
Once installed, clean your Magento cache and compilation (if active) and go to System > Configuration > Sales. In the configuration groups you should see configuration option for enabling the module and choose path where save pdf invoices.
A manual invoice save procedure is provided through a shell script.
Contribution are appreciated. Feel free to open a pull request on GitHub.
Emanuele Gian