Word-a-Day: back up, backup

[Shaun McCance <shaunm gnome org>]

Another easy one.

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back up (v.), backup (n., adj.)
Copy files to another location as a precaution in case of
loss of the original files.  Two words as a verb; one word
as a noun or adjective.  Do not split "back" and "up" when
used as a verb.

Correct:
  Back up your file regularly.
  Create a backup of your files.
Incorrect:
  Back your files up regularly.
  Backup your files regularly.
  Create a back up of your files.
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