i have a MacBook and and iPad. if i'm using my iPad and I add a new contact. will iCloud update my MacBook contacts if the app is not running (on my mac)?
calendar, notes, contacts, reminders, i never close these apps because i don't know if they will be updated if they're not running.
Yes, if you are connected to the internet, the updated data will appear the next time the Contacts application (or any other closed iCloud application) is opened.
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