Rocketbook does not store any of your notes on our servers unless you use some optional Optical Character Recognition (OCR) features. For OCR features, a copy is needed for transcription and when you search your scans inside the Rocketbook app.
If you do not use OCR features, your notes are either on your own device or the cloud service you have sent your notes to. When you send your scans via email, we pass the image file and metadata through an email service provider called Sendgrid to assemble the email. But even there, notes are not stored as they just pass through.