Backupping boards with more than 20,000 cards

[abulaatikko]

Trello export has a 20,000 card limit [1] so boards with more than 20,000 cards created (including archived cards) won't be backupped succesfully by this trello-backup script [2].

Workaround is to create a new board and move only the active cards there and start backupping the new board but maybe it would be possible to add a support to this script to do the json export in batches to enable support for more cards?

[1] https://trello.com/1/resource/limits [2] "Failed to open stream: HTTP request failed! HTTP/1.1 449 Unknown"