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Will NetWorker change the access time (atime) of files when it backs them up?

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This depends on the UNIX platform. On some platforms, such as Solaris, there is a way to read a file without changing its access time, and NetWorker uses that.

On other platforms, NetWorker can reset the access time using the utime system call. If it does this, then ctime is changed. On others, your mileage will vary.