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<blockquote data-quote="MacInWin" data-source="post: 1838192" data-attributes="member: 396914">It's not hard, or even really complicated. It's just not obvious. The installer you would get from NSMacguru's link, for example, won't run in Catalina because it checks to see what version is currently installed and if it's older than what is already there, it won't execute. So to &quot;back up&quot; from Catalina, you have to make a bootable external device, typically on a USB Thumb drive, with the Mojave installer on it, boot from that, erase the drive and reformat it, then install the OS. There is a great third party product called &quot;DiskmakerX&quot; that will make that bootable drive for you. So, you could download the installer, get and run DiskmakerX, follow the prompts to make a USB stick bootable, boot from that and do the work. One benefit would be that you could recover the 50GB that is lost on Bootcamp. However, if the 50Gb isn't that critical, Catalina is pretty solid, as long as you don't try to run 32 bit software. Apple warned developers and users for over two years that Catalina would not support that older tech, but some just didn't listen.</blockquote>

[QUOTE="MacInWin, post: 1838192, member: 396914"] It's not hard, or even really complicated. It's just not obvious. The installer you would get from NSMacguru's link, for example, won't run in Catalina because it checks to see what version is currently installed and if it's older than what is already there, it won't execute. So to "back up" from Catalina, you have to make a bootable external device, typically on a USB Thumb drive, with the Mojave installer on it, boot from that, erase the drive and reformat it, then install the OS. There is a great third party product called "DiskmakerX" that will make that bootable drive for you. So, you could download the installer, get and run DiskmakerX, follow the prompts to make a USB stick bootable, boot from that and do the work. One benefit would be that you could recover the 50GB that is lost on Bootcamp. However, if the 50Gb isn't that critical, Catalina is pretty solid, as long as you don't try to run 32 bit software. Apple warned developers and users for over two years that Catalina would not support that older tech, but some just didn't listen. [/QUOTE]

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