Time Machine backups are but one of 70-80 background services which are run by macOS dispatching systems. Here’s a list of some of the others.
search
Search engines don’t work, as they’re indifferent to quality and accuracy of content. Existing eBook formats are little more than book-in-browser. So how to publish more demanding content?
Can you search documents on your iCloud Drive using Spotlight? Probably, but it doesn’t seem to work using normal metadata indexes.
When you keep documents in iCloud, are they backed up in Time Machine, searched in Spotlight, and kept securely?
How do you get the best results from Internet searches? What about searching for images and specialist content?
How can I constrain Find and Replace in TextEdit to work on just selected text?
How can I stop Spotlight from searching all my .sql files?
How can I set up Google Advanced Search to make its use more efficient?
Yosemite’s extended search reaches out to Bing, Maps, and more. But how can you get the best out of its local search facility?
Tools to take two (or more) documents, work out the differences between them, reveal those in a manner which allows their review, and allow you to apply selected changes found in one document to the other.
The Eclectic Light Company 