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Backup vs back up

Backup vs back up which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

Backup is the most popular phrase on the web.

back up

1221,000,000 results on the web

Backup

1325,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

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Backup vs back up | GrammarChecker.io