I need to export my cards / activities so that I can use the history of the activities in other projects. I have not found a power up to supply this need ... Can I export using an Excel format?
Trello does currently have an export feature, available under the Board Menu > More > Print and Export. The format is JSON, which lends itself well to technical usages, but doesn't load into common programs like Excel. Thus, the export is primarily for people looking to crunch the data with programs of their own or just to back up their data in case of emergency.
If you need spreadsheet support, one option is to check out the Google Sheets and Trello integration with Zapier: https://zapier.com/zapbook/google-sheets/trello/
Another option would be either of these third party Chrome extensions:
Alternatively, if you upgrade to Trello Business Class (https://trello.com/business-class), you can export your board data as a CSV directly from Trello. That can be opened in any desktop spreadsheet program. To show what a board export in CSV format looks like, we've exported the Welcome Board that comes with each new Trello account. You can download the .csv file here.
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