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How to Exclude Items from Spotlight Search
Exclude anything you don’t want indexed (saves time and annoyance).
See Optimizing Spotlight.
The last thing I want is for Spotlight (“mds”) to interfere with my work by indexing my fast Scratch volume, my Time Machine backup slowed to a crawl, etc. Exclude such things.

Exclude backup volumes from Spotlight index;
generally confusing to start editing the wrong document (backup instead of original)
generally confusing to start editing the wrong document (backup instead of original)