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If you are worried about data loss, I would duplicate the site locally as a test install and try on there. If that works fine, I would backup files and DB again before modifying groups on my dev install. TBH I don't recall having data losses by switching goups, but that's not something I typically do every day.


I'm not sure why you need it checked in your exact scenario but this was added in 3.4.21. Information on it here: and here:

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