n designated in the <code>files</code> option will trigger a full restart. Typically, the files vector will be small, as most modifications do not warrant a full restart. An example of when you would want a full restart is when you modify a Var that is used in a thread (that of a web server, for example). This is explained in detail in the <a href="http://danielsz.github.io/2016/05/06/Ghosts-in-the-machine">Ghosts in the machine</a> blog post. 
Check the options with <code>boot system -h</code>. 
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