Another option is the TrelloExport Chrome extension: https://chrome.google.com/webstore/detail/export-for-trello/nhdelomnagopgaealggpgojkhcafhnin?hl=en-US
You may run into a situation where you need to use Trello’s JSON export to locate a piece of information. To do this, we suggest reaching out to a developer—JSON, particularly when it’s covering a whole board, can be complicated to parse out correctly. If a developer isn’t available, you may want to try using an online JSON-to-CSV converter, such as:

https://json-csv.com/

http://konklone.io/json/

http://jsonformatter.curiousconcept.com/

http://www.json-xls.com (This converts to XLS, not CSV)

via Making sense of Trello’s JSON export – Trello Help

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Configuring your firewall for Trello
You can configure your firewall to allow Trello as a trusted source by following these guidelines. Because Trello’s IP addresses can change frequently and without notice, we’d suggest that you use our site’s domain names instead of a particular site IP address.

First, please configure host names to recognize any sub-domain of:

*.trello.com
*.trello.services
*.trellostatus.com
*.braintreegateway.com (paid accounts only)

In addition, these are the domains for the external resources for Trello:

https://trello-backgrounds.s3.amazonaws.com/
https://trello-avatars.s3.amazonaws.com/
https://trello-attachments.s3.amazonaws.com/
https://trello-logos.s3.amazonaws.com/
https://trello-emoji.s3.amazonaws.com
https://trello-stickers.s3.amazonaws.com
https://apis.google.com/ + https://accounts.google.com/o/oauth2 (for SSO (paid accounts only))
dropbox.com (for dropbox attachments)
app.box.com (for box.com attachments)
js.live.net (for one drive attachments)

via Configuring your firewall for Trello – Trello Help

Trello offers three paid options: Trello Gold, Trello Business Class, and Trello Enterprise. They’re ways to build on to the free Trello experience—Trello Gold offers a way for individual users to take their Trello use to the next level, Trello Business Class is intended for multi-user teams to have more fine-grained control over who can access their boards, and Trello Enterprise allows for concierge support as well as additional security features important for large-scale enterprise teams.

via Trello Enterprise vs. Trello Business Class vs. Trello Gold – Trello Help