backup
UK[ˈbækʌp]US[ˈbækˌʌp]
n
a person or thing that supports or provides help to another
n
a copy of computer data that is stored separately so that it can be used if the original data is lost or damaged
n
an accumulation or stoppage caused by a blockage, especially in traffic or a flow of liquid
Morpheme Breakdown
back
up
back
supporting
up
completive
Etymology
The compound 'backup' emerged in the mid-20th century from the phrasal verb 'to back up'. The core concept stems from the literal idea of providing support from behind, akin to reinforcing a position. The 'up' particle adds a sense of completion or readiness, transforming the action into a state or entity that is prepared and supportive. This logic seamlessly extended into computing, where a 'backup' is a supportive copy kept in reserve, and into descriptions of congested flows, where traffic is supported (or held up) from behind.
Analysis
Structure: back (supporting) + up (completive)
'back' is from Old English 'bæc', meaning the rear part of the body, used here in its figurative sense of support or reinforcement. 'up' is from Old English 'up', an adverb indicating completion, intensification, or a final position.
Examples
The star player was injured, so the coach called in his backup.
Remember to create a backup of your important files on an external drive.
A minor accident caused a huge backup on the highway during rush hour.