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Modifying 'Post Bash Script Setting' of instance members will be the most crucial process of cloning groupstack, especially if you customized your source groupstack a lot from its original configuration. Please remind that not a small number of properties of your instances will have been changed through cloning.
Cloning groupstack usually brings all security rules which are refering to any sources inside groupstack, but in case those of outside, you should pay attention to them and modify as necessary.