1

I want to build a backup script using robocopy, but I haven't found any info on why I can't copy files that are open in another program when backing up C: to F:.

I've tried the below, but it's stuck on one file that is open by another program:

RoboCopy "C:/" "F:/" /E

What attributes should I use to skip directories %WinDir% and Windows.old, as well as only copy changed files?

3

RoboCopy will be extremely inefficient at backing up a drive, and would not be recommended in any use case I can think of.


Commands

  • For Windows >8, DISM would be utilized to capture an image (WIM) of a drive:

    DISM /Capture-Image /ImageFile:"Z:\Base.wim" /CaptureDir:"C:" /Name:"Windows Backup" /Description:"Base Image 2017.07.14 @ 20:30" /Compress:Max /CheckIntegrity /Verify /NoRpFix /ScratchDir:"Z:\"
    
    • /ScratchDir is required, else the capture will likely fail since WinPE/WinRE only has 32MB of scratch [temp] space set aside for it by default.

  • In Windows <7, ImageX would be utilized in lieu of DISM.

    ImageX /Capture "C:" "Z:\Base.esd" "Windows Backup" "Base Image 2017.07.14 @ 20:30" /Compress:Recovery /Check /Verify /NoRpFix /ScratchDir:"Z:\"
    



NOTE:

  • It's impossible for an ESD/WIM image to become corrupted
    • Provided imaging commands are always issued with:
      • Windows >8: /CheckIntegrity & /Verify
      • Windows <7: /Check & /Verify

  • ESDs can only be taken of a system partition
    • /Compress:Recovery is the only compression algorithm available.
      • ESD compression ratio is ~33% more efficient than the WIM compression ratio.

  • ESDs/WIMs are smart compression image formats
    • Only changed files are added to an image when a new image is appended to it
      • Newly appended images utilize the same copy of unchanged files already contained within the image from the previous image(s).
        • This allows for an image to remain small in relation to the data contained within.



DISM Prerequisites

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2

Robocopy has option /XD for excluding a list of directories:

/XD "C:\Windows" "C:\Windows.old"

You can get a list of robocopy commands, creating a text file on your desktop via:

Robocopy /? > "%USERPROFILE%\desktop\robocopy_commands.txt"
  • If you want a current backup where both copies are identical, use the /MIR to "mirror" the versions, which will delete files on the backup copy (destination) that are no longer present on the original copy (source); /MIR is a short-hand combination of /PURGE and /E.
  • If you use the /L option, this will list what will happen, but won't actually do the move or copy, which is useful for testing your script before actually taking the time to copy stuff.
  • Robocopy, at least when using /MIR, is restartable and does not re-copy things which have not changed.

To avoid massive slowdowns from problems opening or accessing files, I usually set the retries to some small number and the retry wait to a small interval, like /R:2 /W:2, and then check the log file for failures, handling those manually.

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  • hey, what the option for skip "open\ise files"? – itzikb Oct 26 '16 at 6:21
  • there isn't one. Use the retry and wait options as I suggested above so that the copy process will just move on. The default retry is something like 1 million. Set it to 1 or 2. The wait between retires is 30 seconds. set it to 1 or 2. Also, read the documentation. – Yorik Oct 26 '16 at 14:00

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