Working with Trello offline and synchronization
You can add cards and view cards and add comments to existing cards while offline, but you cannot add comments to new cards you create while offline.  You also cannot view comments, descriptions, or checklists while offline.  Changes will be synced when you reconnect to the internet and run Trello.

You can export your Trello board to JSON format, but I'm not sure what can read that format.  Business users can export to CSV.

Based on these limitations, it probably would not work for your purposes.  You might consider Google Drive or something similar that allows you to work offline and sync when you do go online.