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Keeping copies of OS installer System
I like to keep a copy of the OS X installer app on an external drive, so that I can reinstall or create a boot disk without having to download the whole thing again.

After doing this, I've discovered a non-standard behaviour which you might want to note.

If you decide to redownload the app, it doesn't get saved to the Applications folder as before, but instead REPLACES the copy on your external drive.

This makes it hard to keep archive copies of older OS versions. You'll need to zip them (or rename them?) or store them on a volume that can't be accessed while the app store is downloading.
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Keeping copies of OS installer
Authored by: lutherfuller on Oct 30, '13 08:27:21AM

I always keep a copy of the installer in a sparsebundle disk image file. (You can create these with Disk Utility.)
To use the installer: Mount the image disk; Copy the installer; Then unmount the image disk. Install using only the COPY.
(Never launch the installer within the sparsebundle.)



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Keeping copies of OS installer
Authored by: Typhoon14 on Oct 30, '13 08:32:09AM

Renaming won't do anything. It locates the installer by bundle identifier using the spotlight database.

Only the particular OS installer should be overwritten (Mavericks with Mavericks, Mountain Lion with Mountain Lion, etc) a newer major release installer shouldn't overwrite an older OS



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Keeping copies of OS installer
Authored by: cpragman on Oct 30, '13 09:52:03AM

I keep copies like this too. I keep them on a partition of the external drive that is set to not auto mount. Hopefully the installer won't find them on an Un-mounted volume...



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Keeping copies of OS installer
Authored by: sipatel on Oct 30, '13 10:13:29AM

This has been the case with Mountain Lion (and maybe even Lion). I keep all my installers on an external HD which is only connected to the Mac when copying to and from files to it.



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Keeping copies of OS installer
Authored by: idontwanttoregis on Oct 30, '13 12:21:30PM

Spotlight is annoying for these downloads. See https://groups.google.com/forum/#!topic/comp.sys.mac.apps/MPGsovlXSSY for the newsgroup thread.



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Keeping copies of OS installer
Authored by: Supp0rtLinux on Oct 30, '13 12:50:38PM

Interesting as there's a forum thread about this here: http://forums.macrumors.com/showthread.php?t=1657531
It definitely appears it has something to do with Spotlight indexing and such. Makes you wonder what happens if you put it somewhere that Spotlight is banned from indexing? Or worse... what if it knows its on your external drive, but you still can't download it until you connect the external and delete it, then dump your trash. I could see that being problematic if you've downloaded it to an external, but don't have external available at the time you try to re-download it.



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Keeping copies of OS installer
Authored by: osxrox on Oct 30, '13 01:46:32PM

I keep mine in my Time Machine backup then remove them from my boot HD. They are retrievable as needed an aren't overwritten to my knowledge.



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Keeping copies of OS installer
Authored by: slb on Oct 30, '13 02:24:00PM

Create a .dmg and store these things on there. No drives to mess with, and it's easy to mount/unmount them.



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Keeping copies of OS installer
Authored by: MacManager on Oct 30, '13 05:50:12PM

A disk image is probably a better approach but I just zip the installer I download from the App Store myself.

Also, new in Mavericks- you can create your own install media with (no more hacks):
/Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia

http://support.apple.com/kb/HT5856



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Keeping copies of OS installer
Authored by: hamarkus on Oct 30, '13 06:28:26PM

Why would one re-download them, if one already has a copy on a mounted drive?



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Keeping copies of OS installer
Authored by: Unsoluble on Oct 31, '13 11:04:15AM

Probably the intent is to keep the older installer (10.9.0, say) on the other drive, in case you need to go back to it, but *also* download the newer installer (10.9.1, say) when it's out.



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Keeping copies of OS installer
Authored by: agathezol on Nov 02, '13 03:53:01AM

Call me old-fashioned, but I really don't understand the point of saving the entire Install OSX bundle - extracting the InstallESD.dmg file from each release, renaming it to reflect the respective version number (e.g. "Mac OS X 10.9.dmg") and saving that anywhere I like has never proven a problem.

Granted, when I reinstall OSX, I like to remove the Recovery partition (so the OSX installer rebuilds it from scratch using the new version) as well as preserve my home directory while deleting everything else by hand from Terminal, so perhaps that's why preserving only InstallESD.dmg (and applying it to a flash drive) fits my needs.



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Keeping copies of OS installer
Authored by: ChipMck on Nov 04, '13 07:15:14PM

Starting with Mavericks, InstallESD does not contain the installer. It is just the packages



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