when trying to recover files from a failed drive always clone the drive with any tool thats able to do a sector by sector copy, it will generate you a file with the exact copy of your hdd before trying to rescue files that can be lost forever.
BTW a good backup policy it at least 3 copies of the most important data, 1 on pc (local copy), 1 on nas, and 1 on cloud.
I hope someone finds it useful this suggestion. bye