When you load an old world in a newer version (e.g. 1.12.2->1.13, or 1.13->18w30a), the game asks you if you want to create a backup of the world; however no such option is given if you load a newer world in an older version (e.g. 18w30a->1.13).
Since downgrading is more likely to break worlds, there should be an option (in future versions) to backup when downgrading, or the game should backup automatically if you load the world.
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