Redundancy

[David Fylstra]

Right, Jerry, I remember Mike Bombich commenting a few years ago on the options for future Bootable Duplicates...

> On Apr 18, 2022, at 9:00 AM , xtensionlist-request at machomeautomation.com wrote:
> 
> I read somewhere the Mike Bombich was thinking that he might be able to "pull it off,” anyway.   That he and his crew had some ideas on how they might do it.

However, if you read the web page that I posted, Mike Bombich emphatically unsupports this feature:

"Copying Apple's system is now an Apple-proprietary endeavor; we can only offer "best effort" support for making an external bootable device on macOS Big Sur (and later OSes). We present this functionality in support of making ad hoc bootable copies of the system that you will use immediately (e.g. when migrating to a different disk, or for testing purposes), but we do not support nor recommend making bootable copies of the system as part of a backup strategy.

<snip>

"In the past, a "bootable backup" was an indispensable troubleshooting device that even novice users could rely upon in case their production startup disk failed. The reliability of Apple's External Boot solution has waned in the past several years, however, and the situation has grown starkly worse on the new Apple Silicon platform. Apple Silicon Macs will not start up (at all) if the internal storage is damaged or otherwise incapacitated, so there is very little value, if any, to maintaining a bootable rescue device for those Macs.”

So I think it’s pretty clear that a Bootable Duplicate will not be viable as part of a backup strategy, going forward. 

Dave


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