Originally Posted by
Slow and curious
designed to send hundreds of gigabytes worth of information to the ground as it flies, including flight deck displays, maintenance data, software information and engine health
It would be more accurate to say that it's designed to
collect hundreds of gigabytes worth of information as the aircraft flies.
Optionally, a subset of that information (EHM would be a good candidate, for obvious reasons) may be transmitted to the ground in real time, but only provided that the airline subscribes to some form of satcom-based IP connectivity. The balance of the data (or all of it, as the case may be) is downloadable once the aircraft is on the ground.
There's no suggestion that the onboard server is designed to be crashworthy, nor is it required to be, so don't bank on it providing any useful information.