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.
Hard to believe Trello has 100+ power-ups (known as apps for other Atlassian products) to choose from, enabling us to collaborate with teams and organize our work and personal lives more efficie...
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