Lets play with this scenario a moment.
What if Paul Davies is on the money
"I think it very likely -in fact inevitable-that biological intelligence is only a transitory phenomenon, a fleeting phase in the evolution of intelligence in the universe."
Paul Davies -acclaimed physicist, cosmologist, and astrobiologist at Arizona State University."
That it is inevitable that sentient intellect transitions from biological to an engineered substrate.
That such species are the majority, and that new kids on the block like ourselves the minority.
That they recognise via their own and others experience that its inevitable we will do the same.....................(as our own science is seeking to do right now)
Wouldnt it be an act of great kindness, to lend us their technology to record our history via full conciousness upload, until such time as we can do it for ourselves.
I'm reminded of the lost Dr who episodes
The
Doctor Who missing episodes are the instalments of the long-running British
science-fiction television programme
Doctor Who that have no known film or
videotape copies. They were
wiped (or "junked") by the
BBC during the 1960s and 1970s for economic and space-saving reasons. There are 27 incomplete
Doctor Who serials, with 106 of 253 episodes from the first six years of the programme missing
If individual human experience/conciousness were seen as media, each person simply a volume in our vast library of existance.
It would make sense for species's who have already gone down this path, to save this media on our behalf, to recycle that which would otherwise be wasted.
Perhaps it was done for them, and so they recognise the value of such an act.
Perhaps it wasnt, and they feel the loss of their own history, and as an act of kindness seek to ensure we dont suffer that loss.
Thats just a linear time scenario
If we play with time travel then we start talking about post biological societies vastly, vastly larger than biological societys, living outside linear time and the implications of that as well.
From this perspective biological hatching ponds like earth dont last forever, and thus uploading every last volume from each locale becomes desirable.
Indeed a species that perfects this upload technology would given time travel go back down the linear time chain and "save" those lost prior to the technologys development for a number of reasons.
Spontaneous biological conciousness may only happen in a linear time hatching pond like a planet, thus a post biological population might create such hatcherys for the express purpose of growing their populations and avoiding stagnation.
Stribers sense the earth is a "School" where brand new volumes are created, may come into play here.
This may be where brand new units of conciousness, first learn to exerience. where the basic components of unique conciousness are set down, and matured to graduation status.
Whereapon they are harvested at biofailure to take their place in the vast post biological population which is the greater reality
. 
