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.
So you’re using Trello at work, at home and to track your new DIY crafts. The family and co-workers are all on board and everything is organized, color coded and has a due date. But still, there’s so...
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