“I can see this being useful if, for example, you’re concerned about potentially failing hardware on a machine and want to get it backed up before you can even run to the store to get an external drive,” Holt writes. “In that scenario, this feature could really save your bacon!”
“To configure this, start on the Mac you want to back up to,” Holt writes. “As I noted, this machine will need to be using APFS, so you’ll have to have High Sierra or Mojave installed.”
Easy-to-follow directions and screenshots here.
MacDailyNews Take: You can also use this for MacBooks with limited storage capacity. Have the MacBook(s) back up to your capacious iMac.