It is likely that the material can be accommodated in the sails "Keeper" of the set personal records complete decoding of the human genome (with epigenetic markers), as well as accurate models of the connectome of brain and any materials related to the acquisition of personal information (memoirs). Similar records even after several billion years the hypothetical allow CC to create adequate models of human persons data that seems to be the closest real analogue described in a number of mythological systems "immortality of the soul." This ability to literally "leave your mark in the universe" can serve as an additional motivation for potential project participants.
It might be useful in the framework of this project on one of the stages to organize the sub-project "Crew". Supporters of the project will allow the program crowdfunding to become a "virtual crew members" of interstellar probes "Keepers." Depending on the personal contribution will be possible decryption, archiving and recording in the material sails of "Keeper" information on the genome and, possibly, in the near future, connectome participants and members of their families or others important to them people. On the basis of their private data subsequently within a few billion years, other civilizations can, in principle, to simulate their personality and human society as a whole.
Interestingly, the number of possible copies in the General case is unlimited. (Film "Little Buddha" with a young Keanu Reeves in the title role, the final of a dying Lama creates multiple copies of his soul, incarnating in different children. There is a principal possibility to realize it in reality).
I think that would be a pretty strong motivation to support the project.
Commercial full genome, as far as I know, began to engage J. Craig Venter (http://www.jcvi.org), and now these operations perform several laboratories, including in Russia (for example, https://www.genotek.ru/sekvenirovanie-vsego-genoma). The price is still very high, but it is possible to retain samples of DNA and further sequencing in the future when the cost will be reduced significantly (for example, http://kriorus.ru/other-services#5 ).
Transcript connectome of brain question much more difficult, but certainly solvable. In Russia, in particular, the decision problems involved in the movement "Russia 2045" (http://www.2045.ru/ ), the purpose of which claimed the unrestricted life expectancy, including through the transfer model of personality to non-biological media. In the world, apparently, in General this problem in varying degree do organizations with transhumanist orientation.
Overall this is a real prospect of some part of yourself to make the epic journey in time and space to hundreds of light years to several stars and billions of years into the future (with a guarantee of contact with another civilization!). This can become quite a serious motivation to support the project.
Previously this option was mentioned by Gregory Matloff (The Deep Space Probes, 2005, 12.3, p.169), citing Tipler.
I think this should somehow be noted separately in the further discussion of "Catalysis". At least to estimate the amount of data per person.