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We have several network shares mapped via DFS (Windows Server 2008 R2) on external NAS. That NAS is simple and doesn't support snapshots. We are making backup from the NAS via robocopy but from time to time some files fail to backup because they are open.

We avoid this problem when copying local files by using Volume Shadow Copy.

Is there a way/tool to backup/copy open files from NAS?

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  • As described in the FAQ, product recommendations are explicitly off topic. Oct 16, 2012 at 7:35

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Ignoring the fact that Robocopy, like any other basic file copying program, is an extremely poor choice for making backups, by using a suitable combination of retries and waits (/r and /w) most open files will be copied when the file handle is closed. However, I suggest looking into proper backup software.

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  • Thanks for your answer John, do you know if it is possible to copy a file exclusively open by someone on network share? Thanks Oct 16, 2012 at 8:12
  • An open file is an open file. How or why it's open really makes no difference. There are software techniques for getting around that, usually by taking a snapshot, which incidentally is how Volume Shadow Copy works, but I'm not personally familiar with a program that works that way on a NAS. Oct 16, 2012 at 12:21

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