There are actually a few 'background' tags floating around in the... background.

...Ok, that one was terrible. In all seriousness:

---
###Updates
These tags have been removed:

- <strike>background</strike> - used generically for both background tasks and background images, it has been replaced with more precise tags.
- <strike>desktop-background</strike> (Merged with [tag:background-image])
- <strike>wallpaper</strike> - Synonymised with [tag:desktop-customization]
- <strike>background-job</strike> / <strike>background-process</strike>
 - From Oliver below: 
>Background processes are not an area of expertise and/or interest. There aren't any experts on background processes who would see your question and have an answer because they deal with background processes all the time
These tags don't add any useful grouping or filter to the question, and should be removed/replaced

These are the ones that remain to be cleared:

- [tag:background-image]

Questions about desktop wallpapers/backgrounds should be tagged [tag:desktop-customization] instead. Other uses of these tags should be dealt with on a case-by case basis (but generally just removed).