@bcoleman4 you appear to be the first person to have ever received that error :)
I think you should email support@trello.com because this is definitely either a limitation of the API that they can better inform you of, or it's a bug they need to fix.
In the meantime, you might find you're able to create a new board and duplicate each list (which will copy the cards) instead of copying the entire board all at once.
If you do this, and then one of the lists fails, you could loop through each card in that list until you find out if there is a given card in that list that fails, then find out what this checklist item limit is potentially... basically just go list by list/card by card instead of doing the entire board to use a process of elimination to find a way to make it work.
As for the second part of your question, having a copy of a board would allow it to be restored for use... why don't you just do that? If what you mean is that you want to copy the board then somehow "store" it in a "ready to use" state, then what you could do is copy the board, then create a card in a "board backups" board, with lists for each month of the year and one card per backup date, then link to the backup board from the card and archive the board.
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