Download OS and how to make dmg file upload to cloud

[tinkerbotsict]

Hi you must think this is a stupid question but i need help so i am asking. I had a bit of a nightmare with my mac and in the end i couldnt get the OS from the app store or anywhere else in the end i use a friends mac to download the os and make a bootable version and got my mac up and running again.

 

What i want to do is stick a copy of my OS in my cloud as not always going be able to go to my friend to save the day. But i need to make the file a .dmg how do i do this so that i only need to put it on the USB and good to go.

 

At the moment i have downloaded the file from app store and its sat in a folder so what do i do next?

 

ive tried using disk utility and making a image from file but when i do that i get an error resource busy error 49168

 

I would really like it if someone can tell me please how to i know i must be stupid to be asking lol

Edited February 19, 2018 by tinkerbotsict

[Marci]

Make a bootable USB stick using the installer and Install-Disk-Creator (or whichever tool you prefer).

Unmount the USB stick via Disk Utility.

Create an image of the USB stick via Disk Utility. Upload the created image.

[tinkerbotsict]

I’ve used install disk creator but when I look at the file I can’t see it as an dmg

[Marci]

You're not looking for a file - you use Install Disk Creator to make a complete working functional bootable USB installer.

 

You then run disk utility, select the USB stick, and head to File > New Image > Image from [devicename]. It will then produce a DMG of the contents of the USB Stick.

[tinkerbotsict]

Think I’ve done with your help ?