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"back up" is correct and usable in written English
You can use it as a verb to mean to support or to reinforce or to back someone up, as in the sentence "I always have his back up."
Dictionary
Exact(57)
Back up the truck!
Back up, back up, and back up!
Back up early, back up often.
Back up your TomTom.
Back up everything.
Back up often.
Back up religiously.
Back up your work.
Similar(3)
Back-up heater.
Back-up with iCloud.
Bring back-up clothes.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com