Hi Robert. Thanks for your post and great question. Lucidchart is a cloud-based platform and as such it isn’t possible to download the software itself to a private server. However you can export and download each diagram individually. You can read more about that in our Export/Download Your Lucidchart Documents article.

It also sounds like you might have questions about privacy and data protection. To learn more about what Lucid does to protect your data check out our page about Lucidchart Security.

Please let me know if you have anymore questions.