The Client File System Agent (CFSA) is typically used to apply policy to files copied to removable devices or network locations using Windows Explorer.
However, if a user tries to overwrite an existing file with a new version that contains prohibited text, the CFSA correctly blocks the new version from being copied. But the blocking mechanism also deletes the existing file.
For example, a manager copies a weekly status report from their workstation to a network folder monitored by the CFSA. The CFSA analyzes the report and detects no problems. It therefore allows the report to be copied. Later in the week, the manager updates the report on their workstation with new details about a sensitive project. Now when the manager tries to copy the updated report to the network folder, the CFSA blocks the operation. However, it also deletes the original version of the report in the network folder. Consequently, the only remaining copy of the file is the updated version on the manager's workstation.
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