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The gitHub open source distribution provide a minimal node.js backend suitable just for tests, your backend could be developed in any language. For further information refer to the example backend provided by the distribution.
Access Interpreting wrote a sample PHP backend so you can start from there if you want to use mosaico with an Apache/PHP backend.
In order to configure Mosaico to work with your own backend/deploy, look at Mosaico.init() in editor.html: it takes backed paths as configurations.