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Message: <blockquote data-quote="MacInWin" data-source="post: 1813831" data-attributes="member: 396914">Ok, back to some basics. The screens you showed with options for where to install Mojave are for INSTALLING Mojave. And Mojave requires APFS as the drive format. And the disk Utility you pictured is from BEFORE Mojave, so it doesn't show APFS. Now let's look at your questions: Warning, this is going to be long. Yes, and it will never work with Mojave.Disk Utility does not install the OS.There are separate processes to do that.  And the installer for Mojave should reformat the drive to use APFS as part of the installation. At least it will if there is an OS on the drive already and that OS is being upgraded. That's how it's supposed to work. I'm pretty sure it will change any drive as it is installed to that drive to APFS as part of the process.Yes, the link I provided is from Apple about how to install Mojave. Read the entire thing until you have firm grasp on what it is you need to do, step by step. Maybe even print it off to have at hand as you go through the process. Yes. Boot holding down the CMD+R keys until the options screen appears for the boot options. Select the USB stick. When it is booted, you will have a screen with four options. One of those options is Disk Utility. That Disk Utility will be the proper DU for Mojave. Use that to partition and format the internal drive to APFS. (Make a backup before you start any of this, obviously.)Once the install is complete, it should either boot directly to the new installation or go back to the four options screen. I don't remember which. In either event, you will want to boot into the new installation on the internal drive. It will then ask some setup questions about language and time, including one about encrypting the entire drive with File Vault (I recommend you not use that because if you lose the password, the drive will be locked permanently. FV also has some issues with updates, or has had them. I don't use FV at all, personally.) and then offer to restore from backup, old drive, etc. Take that option to restore. That will launch Migration Assistant. Yep. Now for the second set:Already addressed this above.Yes, old Disk Utility. Make the bootable USB stick following the directions. NOTE: GUID is set in the Partition button, not in the format button, so first do a Partition, create ONE partition that is GUID, then select that partition in the left column when it is indented and ERASE it to format as Mac OS Extended (Journaled). Once that is done, the process to create the bootable installer will continue. CCC should be on the clone. You can do a quick check if you want to, but if you use Migration Assistant to retrieve from the CCC clone, it won't matter if CCC is on the drive or not. If for any reason it's NOT on the CCC backup drive, you can reinstall it to the new internal drive after the Migration Assistant is done.Yes, you can select what you want to restore.  <a href="https://support.apple.com/en-us/HT204350" target="_blank">https://support.apple.com/en-us/HT204350</a> has detailed instructions on how MA works and what to expect as you use it. You might want to print that one, too.I'm not so supremely confident that iCloud caused the problem. But that doesn't matter at this point. Get back in the water and you can look for the cause if it starts to fill up again.</blockquote>

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