Can't boot from backup


i can't seem boot external cloned backup. chose system preferences boot boots main drive. tried use option during startup , external drive isn't listed.

ideas?
 

my guess there's peculiar clone makes unbootable.

has underlying formatting of target drive.

internal (source) drive still usable?
did use create clone? (ccc or sd?)

have tried "updating cloned backup"?

hmmm... since being posted in high sierra forum:
- formatting of internal drive (hfs+ or apfs?)?
- formatting scheme used on cloned backup?
 


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