I’ve tried to create backup and export private keys.
Pressed Ctrl+B, then chose needed folder, then enter filename “wallet” and pressed “Save” button. Then I saw notification window "Tha wallet has been backed up successfully to file: wallet in the backup directory provided to zashd (-exportdir=). And backup file hasn’t been created.
You didn’t state this but can you confirm in the selected back up directory / folder there isn’t a backup file present?
Best to sort files when viewing from explorer or shell based on latest timestamp to be certain a backup was as in fact generated