When an application opens a file, no other application can access it. As long as the file is open, it remains under the exclusive control of the application that opened it, and all other applications—even backup programs, which only need to read the file—are prevented from accessing the file.
The <aof> solves the access control problem. It recognizes file open requests from backup programs (or backup clients, as they are known to the agent) and allows them to be honored, even if they would normally conflict with operating system file access control. Additionally, the agent only honors file-open requests from backup clients, ensuring that all other applications continue to be subject to normal file access restrictions.
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