What makes a local folder-protection workflow trustworthy on macOS?

I’m preparing the launch of Folder Lock Vault, a small macOS utility that turns a normal folder into a local AES-256 encrypted sparsebundle. It mounts as a Finder folder when needed and relocks when ejected; there is no account or cloud sync.

For people who protect client files, financial documents, or personal archives, which part matters most to your confidence in the workflow: clear confirmation that the encrypted copy succeeded, a simple mount/eject experience, better backup guidance, or very explicit passphrase-recovery warnings?

I’m especially interested in practical feedback on the lock → unlock → relock flow. If you test it, please start with non-sensitive sample files and keep a separate backup.