My Book World Edition II Undelete?

Hi, I have deleted a few files (about 10 photos) by accident from my NAS (a World Book World Edition II 4TB) drive. (The drive is running in “mirror mode” - and no backup). Is it at all possible to “undelete” these files? I know that it is sometimes possible to undelete files from internal disks (Windows XP) even after they’ve been deleted from the “trash can” - but the utility I’ve used for that does not operate on NAS drives.

Is there a utility which can help me?