I think, from memory, ... you have to continue once the scan is done to recover the data.
You will need a suitable harddrive for testdisk to copy the data to.
Sorry about my first reply (type over) I was way off base.
Testdisk has had some major advances over the past years, and the "log file" may be of help if your recovery has been interrupted.
and, ... test disk recovers partition information, for data recovery use photorec and/or
dd_rescue