blessing vs backup

blessing and backup both are nouns.

Word	Noun	Adjective	Verb	Adverb
blessing	Yes	No	No	No
backup	Yes	No	No	No

As nouns, backup is a hyponym of blessing; that is, backup is a word with a more specific, narrower meaning than blessing:

blessing (noun)	backup (noun)
the act of praying for divine protection	the act of providing approval and support
the formal act of approving	(computer science) a copy of a file or directory on a separate storage device
a ceremonial prayer invoking divine protection	a musical part (vocal or instrumental) that supports or provides background for other musical parts
a short prayer of thanks before a meal	someone who takes the place of another (as when things get dangerous or difficult)
a desirable state	an accumulation caused by clogging or a stoppage