Hi karatemom,
We are really sorry to hear that. Losing important data can be devastating, especially if it held personal or valuable information. Unfortunately, since the Secure Folder encrypts its contents for privacy, retrieving data without a backup is nearly impossible. Please try the below steps to avoid this situation again:
Enable Secure Folder Backup: Open Secure Folder > Tap More Options (three dots) > Settings > Backup and restore. Sign in to your Samsung account and ensure Secure Folder Backup is turned on. This will save the data securely to Samsung Cloud.
It’s tough, but it's a learning experience that will help you safeguard your data in the future.
Thank you.