What happens if files are open or being changed/deleted during shadow copy image creation?

I am trying to modify our backup process to create the backup without shutting down source control services. I discovered that ntbackup is initiating a shadow copy snapshot before each backup and using that image for the entire backup, but what happens when files are open or being changed/deleted during the short time that the shadow copy is being created?
GrandPixelAsked:
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rhandelsConnect With a Mentor Commented:
Hi, what Microsoft does is it uses it's Volume Shadow Copy feature to create a copy in a single second, meaning it will copy the file like it is on the server. If a user opens a word document and the NTBackup is passing this file for backup it will take the non edited version of the file because the user is still working on the file on it's local laptop. Also, after the file is copied into the snapshot and a file is edited after that, even before Microsoft actually starts writing files to the backup device, it will still use the old file because that's the file in the snapshot..
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