Cannot boot from a backup volume connected

This is a general question which arose from discussions in this thread.  I'm having absolutely no chance to start from a clone assumed my boot volume in my Mac Mini to 2012.  I used the CCC and SuperDuper! to create clones on USB3 of external hard drives, so a volume of Installer for OS X, but little no matter how I try, none of these puppies won't start.  I set them as a startup in Sys Prefs disc, I did cold start and press and hold the option key pressed to make appear alternate volumes bootable (where they always appear), but when all is said and done, Mac growls and grind for awhile and finally gives up trying to start any of these volumes and the switches on the internal drive.

It drives me crazy because I am afraid that if something breaks down the internal disk, none of my backups would help to restore my Mac utility.

I am running 10.11.5.

Troubleshooting suggestions or advice would be welcome.

Well, they seem not interested.  It is ok.  I discovered that my backup hard drive starts to go south.  Well he always accepted read/write commands and backup clone accepted, something was bad, as she was prevented from appearing as a bootable volume.  I swapped out for a new drive and Lickety-split now things happen.  The other problem has been resolved too.

Tags: Mac OS & System Software

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