MacOS - Disable Time Machine notification

December 2016

Each time you connect an external drive, Time machine will ask you if you want to use the latter as a backup media>

To disable this notification:
  • Open a terminal and type the following command:
  • defaults write DoNotOfferNewDisksForBackup -bool YES

To enable it again:
  • defaults write DoNotOfferNewDisksForBackup -bool NO

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