[MacTUG] future of things like carbon copy cloner

[Glenn Anderson]

If yo
Hi Don,

I found the following in the Knowledge Base for CCC...
T2-based Macs disable booting from an external disk by default

If you are attempting to boot a Mac with an Apple T2 controller chip<https://support.apple.com/en-us/HT208862> (e.g. a 2018 MacBook Pro or an iMac Pro) from your CCC bootable backup, be sure to configure your Mac to allow booting from an external hard drive. Apple describes the procedure in this Kbase article:

About Startup Security Utility<https://support.apple.com/en-us/HT208198>

Please do not, however, change the Secure Boot setting for the purpose of booting from a backup. "Full Security" is the default setting, and that setting is compatible with bootable backups.

T2-based Macs can't boot from encrypted HFS+ volumes

Our testing has confirmed that Macs with Apple's T2 controller chip cannot boot from an encrypted, "Mac OS Extended"-formatted, external volume. Booting from an external volume works fine in general, but if your external disk is formatted using Apple's legacy HFS+, "Mac OS Extended" format, enabling FileVault on that volume will render it non-bootable, producing an error message like this on startup:

A software update is required to use this startup disk. You can update now or select another startup disk.

Spolier alert: The "Update" option does not work. This may be a bug in the firmware of the T2 Macs, or it may be a limitation that Apple does not intend to address. In either case, if you want to encrypt your external, bootable backup of a T2-based Mac, we recommend formatting that backup volume as APFS.
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