Apple’s M1 and M2 Apple silicon Macs have a difference that’s tripped some readers up from the way it was handled with previous Intel-based Macs: how to start up or boot an M-series Mac from an external drive. Intel Macs generally make this easy.
You might want to use a bootable external drive to have a high-ercapacity SSD than is offered or affordable via Apple’s pricing. Or you want one for backup in case something goes very pear shaped with your M1 or
