That's bound to result in a conflict at some point with future updates to Big Sur. Not recommended though, since the Big Sur backups would be stored on a hard drive that is formatted differently than the internal hard drive on the Big Sur Mac. IF.you had already been backing up your High Sierra Mac to the WD Machine on the Big Sur Mac would have likely gone ahead and set up the Big Sur backups using the older Mac or HFS+ format.
Older Macs used a format called Mac OS Extended (Journaled), also known as HFS+, so Time Machine backups on older Macs were automatically formatted correctly for Macs at the time. So, the Big Sur Mac backs up to a hard drive formatted as APFS automatically on the first backup to match up the format of the Mac's hard drive with the backup drive. The reason.Apple changed the format of the internal disk on Macs that are running Big Sur to a new type of format called APFS. You would set up one partition of 1 TB and the other also as 1 TB. Yes, but you will need to set up two separate partitions on the WD Drive, one for the Big Sur Mac and the other for the Mac running High Sierra.įor example, say the WD Drive has a capacity of 2 TB. But.things would be much easier, with far fewer chances of errors.if you simply used a separate hard drive for each of your Macs.Ĭan I use the WD Passport to back up multiple laptops?
So, you might be OK if you don't want to set up two separate partitions on the WD drive. Time Machine backed up to the correct WD 500 GB drive. When I did this, two hard drive icons appeared on the my laptop's desktop.WD 500 GB and Backups of (my wife's name) iMac. When the backup was done, I ejected the drive and connected it back to my laptop. The iMac backed up to "Backups of (my wife's name) iMac. As soon as I did this, another hard drive icon named "Backups of (my wife's name) iMac appear on the Mac desktop along with the original drive named WD 500 GB.
Then, I ejected the drive and connected it to my wife's Big Sur iMac and went through the motions of setting up the WD Drive for backups. About 150 GB was backed up in about 2 hours. With no prompting, Time Machine automatically configured the WD Drive in APFS (Case Sensitive) and then backed up the contents of my Mac. I connected the drive to my Big Sur laptop and set it up as a destination for Time Machine backups. OK, I used a 6-7 year old USB WD Passport drive which was formatted in Mac OS Extended (Journaled).
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