Since this might interest other users too, i am also posting this on the forum.
I am worried now that a lot of my tasks have disappeared.
I created a new board in the parking lot, to unclutter my main parking lot and to move some lists over.
Then i went into edit mode of a few of my lists and selected the new board as location.
The lists that i changed all dissapeared and i thought all the tasks in them would move to the new board.
But no i checked, all the lists are in the new board, but no tasks got copied, they are all gone.
Please help me to get the tasks back.
What can i do, or do you have a backup on your servers?
I hope this can be solved.
Thank you, greetings Merish.
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