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How to set up multiple backup disks on Time Machine

a very repeated rule, but little followed in the computer world: always have the maximum possible backups. Storage units, sooner or later, fail; Cloud services, although more secure, still represent a rather heavy investment for the majority of users who want to deposit their entire digital life in them and, in any case, are also susceptible to cyber attacks and / or failures.

So, the old rule holds: if you can, always keep two backups of your files, either on two external drives or on a physical drive and a cloud service, for example.

A, the question comes: the Time Machine It is one of the simplest and most functional backup services out there. Just plug your storage unit into your Mac and wait for the tool to do its job. How, then, to combine the benefit of the two drives with the resource? Fortunately, Apple thought of this as the possibility is not widely publicized.

The steps below refer to the process of configuring your second backup drive on Time Machine; if you don't have any external storage units configured for this task, just follow this brief tutorial from Apple first.

  1. Connect the second backup drive to the Mac, either by cable or Wi-Fi (if it has that connection).
  2. Open it Time Machine System Preferences and click on the option ?Select Backup Disk?.
  3. Select the disk you want to configure as the second backup.

    Backup on Time Machine

  4. The system asks if you want to replace the existing disk with the new one or if you want to keep both; select the option ?Use both?.
  5. Optionally, check the ?Encrypt backups? box if you want to protect your third party data with the active option, they will only be accessible with your system password.

Ready! You now have two backup disks running simultaneously on Time Machine. If their connection (or one of them) is cable, remember to plug it (s) to your Mac periodically so that the backups can be properly updated. The macOS tool uses a rotation system to perform the process on both disks, that is, it detects which one the backup is least up to date on and does the process on it first, then moving to the most up-to-date drive and keeping both more or less p for equality.

This process can be performed with any external HDDs / SSDs or with the late AirPort Time Capsule, just make sure that the devices have enough free space and are formatted in HFS +.

Take advantage and prevent yourself!