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When I interact with Twitter from my website I store a copy of the original post (to provide context on my site) but that helps me capture this for longer-term usage, and I've been able to go back through now deleted tweets!

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As long as you have consent of all authors you can change license at any point then yeah you can, although a commit with a prior licence will still abide by that license, ie allowing folks to continue using software after it's made proprietary etc