Tasks disappeared after moving to new board

Hello Americ.

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.