Things like kids (declared at birth), significant others (declared at weddings), buying houses (declared during the purchase), etc, are all known to the state and taken into account. Pretty easy in most cases.
I don't think there's much possibility to hack the system since to only option you have is to agree or not. And if not I guess you need to file manually.
Designing a hermetic container that lasts for years is non-trivial
Huh ? My cheap plastic watch is hermetic to 4 atm, and for years. Plenty of things are. And for a HD you don't have to stand more than 1/3 atm of pressure differential, something trivial. Having used hard drives at high altitude and seen them die quickly, I always wondered why they don't simply seal the damn things with air at 1 atm inside.
A population of 150 people, proposed by John Moore in 2002, is not nearly high enough to maintain genetic variation. Over many generations, inbreeding leads to the loss of more than 80 percent of the original diversity found within the hypothetical gene. A population of 500 people would not be sufficient either, Smith says. "Five hundred people picked at random today from the human population would not probably represent all of human genetic diversity . . . If you're going to seed a planet for its entire future, you want to have as much genetic diversity as possible, because that diversity is your insurance policy for adaptation to new conditions." A starting population of 40,000 people maintains 100 percent of its variation, while the 10,000-person scenario stays relatively stable too. So, Smith concludes that a number between 10,000 and 40,000 is a pretty safe bet when it comes to preserving genetic variation. Luckily, tens of thousands of pioneers wouldn't have to be housed all in one starship. Spreading people out among multiple ships also spreads out the risk. Modular ships could dock together for trade and social gatherings, but travel separately so that disaster for one wouldn't spell disaster for all. 'With 10,000,' Smith says, 'you can set off with good amount of human genetic diversity, survive even a bad disease sweep, and arrive in numbers, perhaps, and diversity sufficient to make a good go at Humanity 2.0.'"