What data is missing when copying a Trello board compared to exporting its JSON for rollback?

Question

Teams preparing for high‑risk board changes need a reliable snapshot that can be used to roll back to a known state if the change introduces problems.

Because Trello is a cloud‑only service, the only user‑controlled options are creating a board copy or downloading a board‑level JSON export. Documentation confirms that a copy duplicates lists, cards, descriptions and labels, but it does not guarantee preservation of comments, activity history, attachment fidelity, checklist items or custom fields, and workspace limits may block the copy operation. The JSON export captures cards, lists and metadata at a point in time, yet Trello does not provide a documented one‑click restore path from that file, and it is unclear whether all board elements are included in the export.

Which specific board elements (comments, activity history, attachments, checklists, custom fields) are retained in a copied board? Does the JSON export contain all necessary data to reconstruct a board’s state, and is there a documented method to import it back into Trello?

Tasadduq Burney · Answer

AnswerWhen you copy a Trello board, the duplicate retains lists, cards, card descriptions, labels, checklists, attachments and custom fields, but it does **not** copy card‑level comments or the board’s action/activity history. The JSON export (Board → More → Print and Export → JSON) includes lists, cards, descriptions, labels, checklists, attachments, custom fields and the comments that belong to each card, yet it omits the action history array and Trello provides no native import function to rebuild a board from that file.Confirmed factsBoard copy: lists, cards, descriptions, labels, checklists, attachments, custom fields are preserved.Board copy: comments and activity/action history are NOT preserved.JSON export: lists, cards, descriptions, labels, checklists, attachments, custom fields and card‑level comments are present.JSON export: action history array is absent or empty.No documented one‑click import exists for the JSON file.Likely explanationTrello’s copy operation is designed to create a reusable template, so it strips mutable audit data (comments and action log) to keep the artifact lightweight and privacy‑focused. The JSON export aims to give a portable snapshot of the board’s current state; it retains the mutable content (comments) but deliberately excludes the action log for the same reasons, and because there is no native restore path, rebuilding a board from the JSON requires custom scripting via the Trello API.Verification steps (optional)Create a test board, add a comment to a card, and perform several actions (move card, change label, add checklist item).Copy the board and open the copy – verify that the comment and the action log are missing.Export the original board to JSON and inspect the file – confirm that comments appear inside card objects while the actions array is empty or absent.Attempt to restore the board by posting the JSON to Trello’s API (e.g., using /boards/{id}/cards endpoints) – observe that the board can be rebuilt except for the missing action history.

What data is missing when copying a Trello board compared to exporting its JSON for rollback?

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