In a previous post/comment I suggested that the genetic information about nowadays people and animals may be an important information to store on a long term basis.
In the comment I gave a rough estimation on how much computers would cost to capture DNA sequences, I did not include maintanance etc., i.e. the computation was only intended to give an faint idea about the costs. And of course one could also think about storing e.g. bones or the easy available hair, from which the DNA can be recovered.
The option should be voluntarily, but easily accessible to everyone, so that diversity is maintained. it should contain extra information, like geographical and birth/death-date and so on.
I put the suggestion here in a blog post in case people want to discuss.