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backup has 13 distinct synonyms spread across 4 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an accumulation caused by clogging or a stoppage
“a traffic backup on the main street”
someone who takes the place of another (as when things get dangerous or difficult)
“the star had a stand-in for dangerous scenes”
a musical part (vocal or instrumental) that supports or provides background for other musical parts
(computer science) a copy of a file or directory on a separate storage device
“he made a backup in case the original was accidentally damaged or erased”
the act of providing approval and support
“his vigorous backing of the conservatives got him in trouble with progressives”
Synonyms, antonyms and the broader and narrower relations for backup come from Princeton University’s WordNet. Full sources and licences.