Guide : How to make a bootable installer for macOS Ventura

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https://appleinsider.com/inside/macos-ventura/tips/how-to-make-a-bootable-installer-for-macos-ventura

It’s handy to have an external, bootable macOS Ventura installer, but you practically have to fight Apple to make one. Here’s what you have to do.
In Apple’s ideal world, you let your Mac update itself with macOS Ventura, and never have to think about it. In reality, though, Macs go wrong and having a bootable external installer pre-loads download time, and makes it faster to reinstall Ventura when you’re in a bind…

But Apple thinks that allowing external boot drives is a security risk. For longtime Mac users, the risk of allowing a boot drive is low, and the inconvenience of blocking them is high…

In theory, the external drive can be just about any hard drive, SSD, or USB flash drive — and you probably want it to be USB-C. The best results come from NVMe USB-C or Thunderbolt drives, and speed is good on those. While you can use a hard drive, it will be intolerably slow.

Whereas with a USB drive, speed may not be what makes you pull hairs out. Many USB flash drives simply will not boot and there’s nothing you can do about it but try a different one.

Drives in a RAID will not work either and nor will any network-connected drives…

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