I'd recommend at least 15gb for each partition holding a system. Select the Partitions tab in the menu bar, then select the number of partitions you desire using the + - symbols and set the size of each partition. I'd suggest partitioning it if you have a large key. The format should be set to 'Mac OS Extended (Journaled)', and the scheme set to 'GUID Partition Map'. Select your USB key in the left sidebar, then start by erasing the disk using the tab on the menu bar. Plug in your new USB key, then open Disk Utility (located in your Utilities folder within Applications). So you've got your new USB drive - if you're using an old one, copy anything on it to somewhere else because you're going to erase it. Don't be afraid, but be sure to copy the commands exactly as detailed.
I wouldn't go for a USB C one - if you have a USB C only Mac, you'll be sure to have an adaptor for old drives, and that way, your key will work on pretty much anything. I'd recommend a big one - 128gb will do it. The key cost me around £15, the Micromat repair suite is £120 and the MacOS is all free. The first three partitions run MacOS Big Sur, Catalina and Mohave respectively and the fourth runs the excellent TechTool Protogo by Micromat - a bootable repair suite. I have a 128gb USB key that's always to hand, and I've it partitioned into 4 disks. My USB skeleton key has got me out of trouble more times than I care to remember. I run six disks on the studio computer - one is my main OS, another has a duplicate OS and I also run OS Mohave in Parallels Desktop, as my accounts programme is still limited to Mohave.
CREATE MAC INSTALL USB SOFTWARE
I'm still running MacOS Catalina, as my work involves running hundreds of third-party software plugins - not all of which are Big Sur compatible (yet). I make music and run a recording studio for a living, and I'm completely dependent on my computer and operating system(s) running smoothly. You can install a legacy MacOS for older valuable software that no longer works under the current OS.You can install a discrete duplicate system on a different disk partition or external disk for troubleshooting and maintenance.You can use your USB installer to perform a clean install if need be.You can also use them to boot from to partition disks and repair problematic software. You can install the MacOS of your choice without being online, and it's always quicker than using Apple's Recovery Mode.Having a MacOS installer (or in my case, several legacy systems as well as the current one) on a USB key is a basic get out of jail for various reasons: It pays to have a little under the hood knowledge of your everyday work tools, and it really needn't be daunting to learn. There are a few reasons why you may need your own MacOS USB installers for your MacKing Mac computer - or any Apple computer for that matter.
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