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Time Machine back up to another Mac external drive

I have two up-to-date Macs - a laptop and an iMac both on the same network. How can I set up the laptop so it automatically use a dedicated external drive of the iMac for its Time Machine backups? All I can find online is how to use another computers hard drive for Time Machine Backups. TIA


MacBook Pro 14″, macOS 15.0

Posted on Oct 20, 2024 7:47 AM

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5 replies

Oct 21, 2024 2:07 PM in response to Barney-15E

i have already tried this. These instructions are for a “folder” on a hard drive like another Mac -it would work if you could place a folder on a Time Machine back up drive. My Mac external hard drive has been initialized as a Time Machine backup and does not show up as a “folder” and you cannot add a folder to a Time Machine backup volume. As a result you are dead in the water. I contacted Apple and they actually gave me the same instructions and then when we walked through it following the instructions- we both realized there’s no folder on an initialized Time Machine back up drive you can’t follow the instructions any further because of this.

Oct 21, 2024 4:39 PM in response to bob2k2

bob2k2 wrote:

i have already tried this. These instructions are for a “folder” on a hard drive like another Mac -it would work if you could place a folder on a Time Machine back up drive.

Folder, drive, directory, mount point…they're all the same. You can select the whole drive as the "folder."



My Mac external hard drive has been initialized as a Time Machine backup and does not show up as a “folder” and you cannot add a folder to a Time Machine backup volume.

That's a whole different issue. Once you attach a drive to Time Machine, that's all it will be until you remove it from Time Machine and erase it. If you want to use it for network backups along with your Mac backup (directly attached), you will need to add an APFS Volume to the drive after you Erase it. You can then assign one Volume to the directly attached Mac and use the other volume for a network backup.

we both realized there’s no folder on an initialized Time Machine back up drive you can’t follow the instructions any further because of this.

The lack of a folder is not the problem as I explained above.

Time Machine back up to another Mac external drive

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