As far as I could gather, gddrescue seems to be only meant for imaging a disk/partition. You'll have to run data-recovery tools like photorec anyway to recover lost files. So, given that it has made progress now, I'd suggest to let it finish its current task or at least allow it to run as long as you can. You can do the file-check on the files it has recovered so far in the parallel while it is working. So that should help deciding whether they are worth letting it continue or not (some files may be incomplete/corrupt, some should be intact).