In Judaism there is a concept of "chesed shel emet," of a true kindness that can never be repaid. It is usually said with regard to taking care of the needs of the departed, as the recipients of the kindness can never return the favor.
Here is a beautiful example.
During the massacre in the Mumbai Chabad House, the murderers not only shot the Holzbergs multiple times, but they also shot their computer.
An Israeli company has spent many hours recovering the contents of the damaged hard disk, and have now restored thousands of photos and videos of the Holzberg family - priceless memories that can now be seen by the grandparents as well as little Moishe.
Here is an Israeli TV report about this huge mitzvah. It's in Hebrew, but easy to understand even if you don't know the language, and you can also see clips of the Holzbergs that would have been lost forever, as well as the reaction of the grandparents upon seeing these photos for the first time:
Holtzberg's Computer Restored from COLlive.com on Vimeo.