backup vs approving

backup and approving both are nouns.

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

As nouns, approving is a hypernym of backup; that is, approving is a word with a broader meaning than backup:

Other hypernyms of backup include approval, blessing.

backup (noun)	approving (noun)
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 musical part (vocal or instrumental) that supports or provides background for other musical parts
someone who takes the place of another (as when things get dangerous or difficult)
an accumulation caused by clogging or a stoppage

backup (adjective)	approving (adjective)
	expressing or manifesting praise or approval