Quick-fire questions
How to report a bug in macOS to Apple?
Draw up a clear description of the bug, and how an engineer can reproduce it. Before reporting, check with Apple Support that it really is a bug, not a misunderstanding. Then go to apple.com/ feedback, click on macOS in the macOS Apps section, and complete the form.
How to force Spotlight to reindex a disk?
> Open the Spotlight pane and select Privacy. Click on the ‘+’ at the lower left and select the volumes on that disk to add them to that list. Close the pane and wait a minute, open it again, select those volumes and remove them using the ‘–’ tool. Re-indexing appears in Activity Monitor’s CPU tab.
The best way to restore your Mac from a recent backup is to start it up in Recovery with the backup store connected.