A team at CU Boulder has made a curious state of matter in which particles move constantly—like a clock with hands and gears ...

So a user has a new 10.7 MBA with a 256GB SSD, of which 9GB are used. There is an external USB drive (natch) 500GB large, and we can't get more than 5 days backups before it says it needs to clear out ...

Automated Time Machine backups should be a “set it and forget it” strategy. Once enabled, macOS warns you only when something goes wrong. No alerts, and–almost always–the backups have continued apace.