Simply having a boot volume group with a System snapshot in it won’t get your Mac to start up from that disk, particularly if it’s an Apple silicon model. Some details.
startup
When you start your Mac up, the fans blow full on, and you see CGPDFServices taking lots of CPU %. Is this malware? No, but it’s new in Sonoma.
Sometimes, a cold boot fixes problems not fixed by a simple restart. Why, and which problems is it better at fixing?
What to do when your Mac panics during booting, and enters a boot loop, or when it simply fails to get to the login window.
On Intel Macs, key combinations determine startup modes and more, but they have no effect on Apple silicon Macs. And how to deal with keyboard problems when logging in.
This has changed greatly over the last few versions of macOS, and differs between different types of Mac. Here’s an outline.
Browse log entries for a recent boot, examine the entries for Time Machine, and check for errors in another subsystem.
A step-by-step fully illustrated guide to how to use every feature in Recovery Mode on an M1 or M2 Mac running Big Sur, Monterey or Ventura.
From Diagnostics Mode to Terminal, a full account of the features available to Apple silicon models, how to engage them, and navigation.
With the right enclosure, a Samsung 980 PRO NVMe SSD delivers transfer speeds of around 2.8 GB/s. Does that make booting from it any faster, compared with an SSD at half the speed?