I had a disk crash in spring this year and my backups were relative old!
So I bring my disk to VOGON in munich/Germany and let them rescue the data,
because my disk was totally dead. No chance for a rescue software.
The good thing was that they make an analysis what they can rescue,
and you can decide if you want to do it for the offered price.
(There are also other rescue services here in germany.)
It was very expensive, but I got back my sources.
That was a expensive lesson to backup after each session.
(A external USB disk is much cheaper!)