Any way to properly back up the Installer file?

Discussion in 'OS X El Capitan (10.11)' started by definitive, Sep 24, 2016.

  1. definitive macrumors 68000


    Aug 4, 2008
    I've downloaded El Capitan from the App Store, and backed up the InstallESD.dmg file to an external drive by simply copying it from the main .app file. I've done this with previous versions of OS X as well. Now when I try to make an installer out of it with DiskMaker X, it doesn't seem to work, and tells me I can't use that file to create a USB installer.

    Did I back the files up wrong, or is there some way to use InstallESD file to manually create the USB install drive using the Terminal?
  2. Gav2k macrumors G3


    Jul 24, 2009
  3. simon lefisch macrumors 6502a

    simon lefisch

    Sep 29, 2014
    Why not just backup the main El Cap app? I did the same with Sierra. Downloaded it from the App Store and zipped it up to store on my server. That way I can use the commands from the link provided in the post above mine to create a bootable USB if needed.
  4. NoBoMac macrumors 68020

    Jul 1, 2014
    What Gav2k said.

    Seems, to me, that the Diskmaker route seems to be more problematic than stock OS X method. Seems like issues with recovery media almost always have "Diskmaker X" in the steps taken.

    For what it's worth, have always used createmediainstall command with no issues: just last week, re-verified my El Cap install thumbdrives, no issue.
  5. Fishrrman macrumors P6


    Feb 20, 2009
    The easiest thing to do is to just copy the entire El Cap installer from your Applications folder to wherever you wish to save it.

    Then it will be preserved "as Apple sent it".

    I keep archives of ALL important Apple software that I've installed, going back many years.

    No need to fight with Apple's website to get the stuff again!

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4 September 24, 2016