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How to set your Mac as a shared backup destination for Time Machine

Whereas Time Machine in macOS 10.15 Catalina nonetheless can’t again as much as a straight related APFS-formatted drive—solely to at least one formatted with the older HFS+ filesystem—you possibly can again up over a community to most volumes that may be shared, together with different Macs.

There’s a semi-hidden characteristic within the Sharing choice pane which you can arrange:

  1. On the vacation spot Mac, open the Sharing choice pane.

  2. Click on File Sharing Service, or verify its field if it’s not already turned on.

  3. Underneath Share Folders, click on the + so as to add a folder.

  4. Navigate within the dialog field to the Shared folder within the Dwelling folder. Choose it after which click on Add.

  5. If you happen to’re not involved about different customers on the community go away the Customers choices for entry permissions as they stand (all set to Learn & Write). If you wish to restrict it to logged in customers, click on Everybody and set the permission to No Entry. (You may as well disable the opposite two choices an add particular person customers there.)

  6. Now Management-click the Shared folder within the Shared Folders record and choose Superior Choices.

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Use Superior Choices to share as a Time Machine vacation spot.

  1. Verify “Share a a Time Machine backup vacation spot,” and optionally verify the “Restrict backups to quantity GB” to stop backups from overwhelming this machine.

  2. Click on OK.

  3. On every other Mac on the community, open the Time Machine choice pane.

  4. Click on Choose Disk.

  5. The shared quantity ought to seem beneath Out there Disks and observe that it’s “on ‘laptop identify’” with the identical identify as seems within the Shared choice pane on the shared laptop.

  6. Choose the quantity and click on Use Disk.

  7. If you happen to opted in step 5 to require an account to make use of the folder, you’ll be prompted to enter the username and password of the macOS account at this step, and the drive will likely be mounted.

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Time Machine acknowledges the Shared folder as an obtainable vacation spot.

Now the Shared folder-as-a-volume seems as a specific quantity. I’ve present in testing that even for those who specify a restricted quantity of Time Machine storage, the Time Machine choice pane nonetheless reveals all obtainable storage remaining on the goal quantity.

This Mac 911 article is in response to a query submitted by Macworld reader David.

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