Your project, as well as all changes you make, are automatically saved.
This automatic saving is done as soon as you :
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add a screen
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insert media/audio
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add text
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modify your media, texts, settings
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etc...
Each new backup overwrites the previous one. It is therefore not possible to find a previous version or to go back in time. When in doubt, before making a change, you can duplicate the project and only change one.