Currently RadRichTextBox does not support RTF import and export. It is on our to-do list, but we cannot give you a specific timeline for this feature.
I'd suggest you review the data providers that RadRichTextBox offers here
and see if any of them fits your needs.
As it comes to database saving and loading, you can find a demo in this post
and additional information here
If you have any other questions, feel free to contact us again.
All the best,
the Telerik team
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