Hi @Maxime Raïa , I just wanted to clarify if you meant you closed the board or went one step further and fully deleted it.
Once a card or board is fully deleted, there's not a way to retrieve it. However if you closed the board, you can reopen it with the following steps:
If you want to make backups of your board for future, you'd need to make copies of the board as often as you feel necessary, and then you can delete the copied board as you copy new ones.
Please let me know if this helps.
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