What happens when copying a document that is being edited on Windows10?

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I found my backup and sync program (Icedrive) never completes on my windows 10 computer, and I fear it is due to it resetting the copying progress when the file is edited.

I'm not talking about appending to document but rather the follow scenario

0.Initial
original | 012345
copied   | 

1.Copied half-way
original | 012345
copied   | 012

2.Edited
original | 0a23c5
copied   | 012

3.What to do now?
3.1 Continue to copy but the file is corrupt 
original | 0a23c5
copied   | 0123c5

3.2 Restarting 
original | 0a23c5
copied   | 
0 Answers
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