How does it work?
When a request is made to
//example.com/old-path that does not exist, Boomla looks at the version history of the site to find the file. Boomla files have fileIds. If the file was found, the fileId is noted and the live version of the website is searched for that fileId. If it is found, the visitor is redirected.
The great thing about this is that it requires no actions on your end. (Except for commiting your changes, which you should do anyway.)
So, no matter how often you rename and reorganize your pages, Boomla will keep track of them.