impede vs back up

impede and back up both are verbs.

Word	Noun	Adjective	Verb	Adverb
impede	No	No	Yes	No
back up	No	No	Yes	No

As verbs, back up is a hyponym of impede; that is, back up is a word with a more specific, narrower meaning than impede:

impede (verb)	back up (verb)
block passage through	establish as valid or genuine
be a hindrance or obstacle to	become or cause to become obstructed
	make a copy of (a computer file) especially for storage in another place as a security copy
	move backwards from a certain position
	give moral or psychological support, aid, or courage to