It's not possible to restrict archiving/deleting to only admin. Anyone with access to the board can archive and delete cards.
Only an observer would be restricted, but they would also be restricted to only being able to comment (and vote) on cards.
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A blank Trello board can be both a beautiful and intimidating thing. How many lists should I have? Is creating 10 labels overkill? How can I best track my progress? Is there a way...
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