A Mac laptop can work perfectly well as a networked Time Machine destination, but if you take it somewhere else, put it to sleep, or unplug it from battery power, backups cannot occur.

Apple's Time Capsule was discontinued long ago, but you can still get them to do your Time Machine backups on a modern network. Here's how.

Warning: Apple Says macOS 27 Won't Support AirPort Time Capsule Backups Tuesday June 10, 2025 8:23 am PDT by Joe Rossignol ...