AzCopy while source container is written

I tried to do some research but unable to find the answer. Let's say you have container A. at 1pm, container A had the following files:

1. test1.txt (inside the file is abcdefg)
2. test2.txt (inside the file is klmnopq)

AzCopy was performed to container A , copying it from storage C to storage D. It started at 1.01pm and finished at 1.05pm.

At 1.02pm, mr.X performed the following:

1. Add test3.txt inside container A
2. Modify test1.txt to "defgh"

The question is, what does end up in storage D for container A copy?

1. the original files? ie test1.txt (inside the file is abcdefg) and test2.txt (inside the file is klmnopq)
2. or something else?

thanks