I doubt the original would be corrupted just because another program tried to make or made a copy of it. I have used Robocopy in may years and never used it as my primary backup software. Whatever software I'd use for primary backup would not attempt to backup and file that was open, whether it was being written to or not, and would log what files were not backed up. I then review the backup logs and if any files that were not backed up were important I'd make sure those files were not open and then do a backup of the files that weren't backed up. On average most of the time the files would not be open anyway on the next nights backup, so over time there typically was always enough backup copies to fall back to. If your goal if to ensure 100% full and complete uncorrupted backups then you'll need to ensure that either all file being backed up do not have open file handles and or use a backup software that can make a volume shadow copy and make the backup from it not the original.
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