fix: "Back up" is two words when used as a verb

[kdmccormick]

Description

There is a new menu item "Backup to local archive". Backup is the correct spelling when using it as a noun or adjective, but the menu item uses as a verb, so it should be two words, back up, i.e. "Back up to local archive"

Note: alternatively, if we want to stick with the spelling "backup", the menu item could be rephrased. For example, "Create local backup" or "Local backup archive" use the noun and adjective forms, respectively.

If accepted I'll backport (back port?) this to Ulmo.

Before

After

Supporting information

https://www.merriam-webster.com/dictionary/backup#dictionary-entry-2

Best Practices Checklist

N/A

[bradenmacdonald]

Looks like you'll need to update the corresponding test too, before this can merge.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.85%. Comparing base (7351593) to head (bb0a65b).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2696   +/-   ##
=======================================
  Coverage   94.85%   94.85%           
=======================================
  Files        1232     1232           
  Lines       27870    27899   +29     
  Branches     6129     6136    +7     
=======================================
+ Hits        26436    26464   +28     
- Misses       1376     1377    +1     
  Partials       58       58           

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