2016 MBP Touch Bar cannot be charged and is now dead.

My laptop had always been perfectly working well until three days ago it could not be charged anymore and it is now dead. I watched a two-hour long film with full charge at beginning but the battery went down to 27% when the film ended. I was very shock, so I started charging it. But it the battery percentage did not go up but kept dropping until it was totally out of power. Then I tried to charge it overnight. In the morning when I work up I found that it was still out of power. Then I tried another charger through different ports on the laptop, it still did not work.

Then I sent it to Apple Store. The technician used his charger to try to boost it but failed. He then told me the worst case is that the logic board could be damaged. He said as the SSD is soldered into the logic board on the 2016 MBP, so the data will be lost if the logic board needs to be replaced.

There were some important files in my laptop without backup. I really need to take all data out. I am wondering A) how likely is the logic board damaged in my case and B) is there a way to get my data out intact?

I am yearning to hearing a voice which would make me less worried cos I am really really worried.