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I once heard a non-english speaker say "logining", and that made so much more sense than "logging in".

Noun versus verb.

Did you log in (space: split verb)? What is your login (no space: noun)?

Do you have a backup (noun)? Did you back up (verb)?

Did you do a backup :-)

Very succinct Calvin & Hobbes quote: "Verbing weirds language"