Locking topics to be accessed by members-only


Since recently ish I've been managing a Discourse Community and the business I work for is considering locking all topics to be members-only.

What would be the best way to do this - using tags? I have tried this a while back but members complained they lost access to the topic altogether, so I'm a bit cautious about doing it again and causing mayhem....

Thanks in advance, much appreciated!

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