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'to back up' is correct and usable in written English.
It is usually used as a verb meaning "to support or provide evidence to confirm something". For example: "He provided a receipt to back up his claim that he had paid the bill".
Exact(60)
She had to back up.
We have to back up.
This causes them to back up.
He kept telling me to back up.
Provides handy charts to back up case.
Day struggled to back up his words.
To back up, what are lymphatic vessels?
To back up a bit.
"He's got to back up.
There's research to back up Hooper's theory.
A first-rounder to back up McNeil?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com