Botting from Cloned Disk

I restored.my startup disk from a clone I made of it earlier in the month. When I tried to boot up from the restored clone, my MB Pro Pro load half way and atopped.

I don't understand why doean't a file synch clone or.duplicate clone boot up my Mac when it has been copied back (restored) to the start up drive .... which was erased and reformated prior to restore?

I would apprecoate any advise, including how to use cloning as part of a back up plan.

Thank you,
Frank