If you need local backup of your important boards, lists and cards, you use TrelloBack (not yet!!!).
One binary to rulу all yours trello-kanban-lists-etc...
Simply download one execution file from releases and config file.
Because Trello use some limitations to 3rd-party API-request you need get API KEYS:
Rename config.example.json to config.json.
Log In or Sign Up to Trello, go https://trello.com/app-key and copy your key to api_key.
Then you need generate API Token on the same page and copy your token to api_token.
And last but not least - input once and future folder of backups to destination_folder. Remember use // instead of /!!!
Start TrelloBack execution file in GUI or CLI. Wait some time, make tea, do your deeds.
And you get as many json files as your Trello Cards in folders named by Trello Organization and Trello Board.
(Psst, organization name "Personal" reserved for boards without organization, sorry)
Each filename begins with name of Trello List and ends with name of Trello Card.
In json file you can find your valuable data that stores on your harddrive.
Incremental backup
More information of cards
Backuping to Zip