When multiple Macs are "competing" for the same backup space, there might be room for several months of backups for one, but only a few weeks for another. This is especially likely to happen if you start backing-up a new Mac to a drive that already has a lot of backups from another Mac. Time Machine on the new Mac will not delete backups from the other Mac s , so when it needs space for new backups, it will delete the oldest backups from the new Mac instead.
If you replace one of the Macs, Time Machine on the new one won't delete the backups from the old one. And sometimes it's advisable after certain problems. It is possible to delete individual backups via Time Machine's "Star Wars" display, but it's one-at-a-time, so rather tedious.
Time Machine itself will make sure that the data is not getting mixed up by using the name of each Mac as part of the path. For what it's worth, I have this setup running in a few locations with a single NAS, and multiple machines backing up to it.
Home Questions Tags Users Unanswered. Can there be two separate Time Machine Backups on the same external drive?
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Also contrary to what's suggested by Mattia, you do not need to have multiple partitions although that might be handy. And for the utility point of view one partition or two is the same if you use the partitions only for backup. Mattia, You're certainly entitled to your opinion, and I don't necessarily disagree with the statement you made in your comment.
However in your answer you start by saying "If you make two different partitions in the external HD Follow the below mentioned steps on every Mac that you intend to back up to target Mac external drive:. Step 1: Step 2: In the Network window, double click the Mac.
Jan 29, If you have more than one Mac but don't want to use a separate hard drive to back up each one, Time Machine can help. If you make two different partitions in the external HD, you can easily disk formatted with HFS+ as a Time Machine target for several Macs.
Step 3: If prompted, enter the login ID and password from another Mac. If the information is already stored, a list of folders and drives will be displayed.
Step 4: Now, to mount the Time Machine in the Finder you have to double click on it. Step 5: It will be something like this:. You can now perform steps 3 — 5. Once the Macs are connected, macOS will automatically create the required subfolders to keep the backup data separately on the external drive.
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