Maybe you're talking about the build step that's at the end of ./nodebb setup? In that case, you could save copies of the build directory as long as you use the same version of NodeBB and plugins for everywhere you're installing it.
Just setup my first bbs with NodeBB
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I am moving this to https://bbs.zzn.im/topic/3/new-site-setup-journal
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@xinbenlv I think you can change this setting from Admin Control Panel... (or completely remove restriction)