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1 [mass noun] help or support: no police backup could be expected
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someone or something that can be called on if necessary; a reserve: I’ve got a security force as backup [as modifier]: a backup generator
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2 Computing a copy of a file or other item of data made in case the original is lost or damaged: make a backup of any important files [as modifier]: a backup copy
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[mass noun] the procedure for making backup copies of files or other items of data: automatic online backup
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3North American an accumulation of something caused by a blockage, as in traffic or water: there are long backups on all routes