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WINDOWMIZER FOR MAC USE OLDER VERSION IF BUY NEW INSTALL
WINDOWMIZER FOR MAC USE OLDER VERSION IF BUY NEW DOWNLOAD

dmg approach, because it would be "Fun", then go for it, as learning things is never a bad thing. I think this would be the least amount of up-front-work for an event that may never happen. And it can be an emergency bootable device. I would suggest you keep around at least one bootable copy of the oldest version of the OS that will boot on your Mac so that if you have to re-download an OS installer, the App Store will not complain that your OS is too new. Since you are creating a bootable installer just when you need it you do not need to have a dozen of them laying around. I think the data is also compressed, and there is no unused space in it. The "Install OS X " installer is as compact as you are going to get.

During the just installed OS Setup, point it at your just created backup to restore all your user data and apps you installed.

WINDOWMIZER FOR MAC USE OLDER VERSION IF BUY NEW INSTALL

Use the freshly created bootable installer to install the older OS.

You might even be able to use a partition on a larger USB device, and then boot holding the Option key to select it (never tried this, but I suspect it will work).

Since you will need a bootable installer, use DiskMakerX "Now" to create one on any available USB device you can use to host it for the hour that you will need it.

When you decide you want to go back to an older OS, make a backup of your current system so you have your user data available to restore (actually being paranoid about my data, make 2 backups using 2 different backup utilities to 2 different backup devices ).

WINDOWMIZER FOR MAC USE OLDER VERSION IF BUY NEW DOWNLOAD

Keep a copy of each "Install OS X " installer on your boot disk (or another safe place) in its original download form.I assume you are not going to be doing this every other day (in fact maybe never), so what I think I would do, is Are not all *dmg to be first "opened"/mounted? So here *cdr would be the right choice? Could this be done from a *dmg that has to be mounted? I guess not.

which option is correct?Ĭ) I want to have an emergency OS on an external device that I can boot from. Now I want to save it externally, so I don't have to wait hours for the slow wifi next time and just use an USB-stick or whatever to install it again. Which option from the above, do I use?ī) I made a fresh install from the internet on my internal HDD, added some of my favourite apps. Later I see "B" is not that good, so I want to go back to "A".

Then I delete the internal HDD and install "OS install B". Then I save "A" (with whatever option is appropriate) to an external disc. Do all of these copy the whole disc including empty space? Like it seems to read here Disk Utility for Mac: Create a disk image using Disk UtilityĪ) I have "OS install A" on the HDD inside my Mac.